Updated on 2024/07/28

Information

 

写真a

 
ONDA KEN
 
Organization
Faculty of Science Department of Chemistry Professor
Research Center for Negative Emissions Technologies (Joint Appointment)
School of Sciences Department of Chemistry(Joint Appointment)
Graduate School of Sciences Department of Chemistry(Joint Appointment)
Title
Professor
Contact information
メールアドレス
Tel
0928024170
External link

Degree

  • Ph.D

Research Interests・Research Keywords

  • Research theme:Structural analysis of photofunctional materials studied by time-resolved infrared vibrational spectroscopy

    Keyword:Infrared Spectroscopy, Ultrafast Spectroscopy, Photochemistry, Photofunctional Material, Reaction Dynamics

    Research period: 2017.4

Papers

  • Matthew effect: General design strategy of ultra‐fluorogenic nanoprobes with amplified dark–bright states in aggregates Reviewed

    5 ( 2 )   2024.1

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    Abstract

    Fluorescence imaging, a key technique in biological research, frequently utilizes fluorogenic probes for precise imaging in living systems. Tetrazine is an effective emission quencher in fluorogenic probe designs, which can be selectively damaged upon bioorthogonal click reactions, leading to considerable emission enhancement. Despite significant efforts to increase the emission enhancement ratio (IAC/IBC) of tetrazine‐functionalized fluorogenic probes, the influence of molecular aggregation on the emission properties has been largely overlooked in these probe designs. In this study, we reveal that an ultrahigh IAC/IBC can be realized in the aggregate system when tetrazine is paired with aggregation‐induced emission (AIE) luminogens. Tetrazine amplifies its quenching efficiency upon aggregation and drastically reduce background emissions. Subsequent click reactions damage tetrazine and trigger significant AIE, leading to considerably enhanced IAC/IBC. We further showcase the capability of these ultra‐fluorogenic systems in selective imaging of multiple organelles in living cells. We term this unique fluorogenicity of AIE luminogen‐quencher complexes with amplified dark‐bright states as “Matthew effect” in aggregate emission, potentially providing a universal approach to attain ultrahigh IAC/IBC in diverse fluorogenic systems.

    DOI: 10.1002/agt2.499

  • Room-temperature quantum coherence of entangled multiexcitons in a metal-organic framework. Reviewed International journal

    Akio Yamauchi, Kentaro Tanaka, Masaaki Fuki, Saiya Fujiwara, Nobuo Kimizuka, Tomohiro Ryu, Masaki Saigo, Ken Onda, Ryota Kusumoto, Nami Ueno, Harumi Sato, Yasuhiro Kobori, Kiyoshi Miyata, Nobuhiro Yanai

    Science advances   10 ( 1 )   eadi3147   2024.1

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    DOI: 10.1126/sciadv.adi3147

  • Indication of Intramolecular Triplet–Triplet Annihilation Upconversion in Organic Light‐Emitting Diodes Reviewed

    12 ( 3 )   2023.10

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    Abstract

    It is well known that triplet–triplet annihilation upconversion (TTU) can enhance electroluminescence (EL) efficiency by converting two low‐energy triplet excitons into one high‐energy singlet exciton. However, conventional intermolecular TTU requires high doping concentration to activate, limiting device architecture. Here, six dimer molecules comprised of two anthracene units connected by a spacer unit are investigated, which have a possibility of the intramolecular TTU process. As a result, two dimer molecules show high TTU efficiencies close to the theoretical maximum even in dispersed, diluted conditions. By comparing these molecular conformations, a correlation is found between the dimer structures of two anthracene units and the TTU activity in the diluted condition, i.e., the 3D molecular structure with the exciton utilizing efficiency.

    DOI: 10.1002/adom.202301924

  • Structural‐transformation‐induced Drastic Luminescence Changes in an Organic‐Inorganic Hybrid [ReN(CN)4]2− Salt Triggered by Chemical Stimuli Reviewed International journal

    2023.6

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    DOI: 10.1002/anie.202306853

  • Highly Efficient Supramolecular Photocatalysts for CO2 Reduction with Eight Carbon–Carbon Bonds between a Ru(II) Photosensitizer and a Re(I) Catalyst Unit Reviewed

    2023.6

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    DOI: 10.1021/acscatal.3c01407

  • Highly efficient light harvesting of a Eu(III) complex in a host–guest film by triplet sensitization Reviewed International journal

    2023.5

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    DOI: 10.1039/D3SC01817B

  • Singlet fission as a polarized spin generator for dynamic nuclear polarization Reviewed

    Yusuke Kawashima, Tomoyuki Hamachi, Akio Yamauchi, Koki Nishimura, Yuma Nakashima, Saiya Fujiwara, Nobuo Kimizuka, Tomohiro Ryu, Tetsu Tamura, Masaki Saigo, Ken Onda, Shunsuke Sato, Yasuhiro Kobori, Kenichiro Tateishi, Tomohiro Uesaka, Go Watanabe, Kiyoshi Miyata, Nobuhiro Yanai

    Nature Communications   14 ( 1 )   2023.3

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    DOI: 10.1038/s41467-023-36698-4

  • Unprecedented highly efficient photoluminescence in a phosphorescent Ag(I) coordination polymer Reviewed International journal

    Haruka Yoshino, Masaki Saigo, Kiyoshi Miyata, Ken Onda, Jenny Pirillo, Yuh Hijikata, Wataru Kosaka, Hitoshi Miyasaka,

    Chemical Communications   59   4616 - 4619   2023.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/D3CC00179B

  • Solvent-dependent dual emission processes in charge-transfer excited states of phenothiazine-triphenyltriazine conformers Invited Reviewed

    Tomohiro Ryu, Kiyoshi Miyata, Masaki Saigo, Yuushi Shimoda, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi, Ken Onda

    Chemical Physics Letters   809   140155 - 140155   2022.12

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    DOI: 10.1016/j.cplett.2022.140155

  • Eliminating the Reverse ISC Bottleneck of TADF Through Excited State Engineering and Environment‐Tuning Toward State Resonance Leading to Mono‐Exponential Sub‐µs Decay. High OLED External Quantum Efficiency Confirms Efficient Exciton Harvesting Reviewed

    Hartmut Yersin, Rafał Czerwieniec, Larisa Mataranga‐Popa, Jan‐Michael Mewes, Gang Cheng, Chi‐Ming Che, Masaki Saigo, Shuji Kimura, Kiyoshi Miyata, Ken Onda

    32 ( 34 )   2201772 - 2201772   2022.8

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    DOI: 10.1002/adfm.202201772

  • A Red‐Light‐Driven CO‐Releasing Complex: Photoreactivities and Excited‐State Dynamics of Highly Distorted Tricarbonyl Rhenium Phthalocyanines Reviewed

    Chemistry – A European Journal   2022.7

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    DOI: 10.1002/chem.202202281

  • Highly Fluorescent Bipyrrole-Based Tetra-BF2 Flag-Hinge Chromophores: Achieving Multicolor and Circularly Polarized Luminescence. Reviewed International journal

    Luxia Cui, Hyuga Shinjo, Takafumi Ichiki, Koichi Deyama, Takunori Harada, Kohei Ishibashi, Takumi Ehara, Kiyoshi Miyata, Ken Onda, Yoshio Hisaeda, Toshikazu Ono

    Angewandte Chemie (International ed. in English)   e202204358   2022.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/anie.202204358

  • Heavy metal-free visible-to-UV photon upconversion with over 20% efficiency sensitized by a ketocoumarin derivative Reviewed International journal

    Masanori Uji, Naoyuki Harada, Nobuo Kimizuka, Masaki Saigo, Kiyoshi Miyata, Ken Onda, and Nobuhiro Yanai

    JOURNAL OF MATERIALS CHEMISTRY C   10 ( 12 )   2022.3

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    DOI: 10.1039/d1tc05526g

  • Characterisation of Excited States in a Multiple-Resonance-Type Thermally Activated Delayed Fluorescence Molecule Using Time-Resolved Infrared Spectroscopy Reviewed International journal

    Masaki Saigo, Yuushi Shimoda, Takumi Ehara, Tomohiro Ryu, Kiyoshi Miyata, and Ken Onda

    Bull. Chem. Soc. Jpn.   95   381 - 388   2022.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1246/bcsj.20210403

  • Low-Threshold Exciton-Polariton Condensation via Fast Polariton Relaxation in Organic Microcavities Reviewed International journal

    ADVANCED OPTICAL MATERIALS   10 ( 3 )   2022.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/adom.202102034

  • Aggregation-induced Emission Active Thermally-activated Delayed Fluorescence Materials Possessing N-Heterocycle and Sulfonyl Groups Reviewed International journal

    Yasunori Matsui, Yudai Yokoyama, Takuya Ogaki, Kenta Ishiharaguchi, Akitsugu Niwa, Eisuke Ohta, Masaki Saigo, Kiyoshi Miyata, Ken Onda, Hiroyoshi Naito, Hiroshi Ikeda

    J. Mater. Chem. C   10   4607 - 4613   2022.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/D1TC05196B

  • Challenges for developing photo-induced phase transition (PIPT) systems: From classical (incoherent) to quantum (coherent) control of PIPT dynamics Invited Reviewed International journal

    Shinya Koshihara, Tadahiko Ishikawa, Yoichi Okimoto, Ken Onda, Ryo Fukaya, Masaki Hada, Yasuhiko Hayashi, Sumio Ishihara, Tadeusz Luty

    PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS   942   1 - 61   2022.1

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    DOI: 10.1016/j.physrep.2021.10.003

  • Enhanced Light-Matter Interaction and Polariton Relaxation by the Control of Molecular Orientation Reviewed International journal

    ADVANCED OPTICAL MATERIALS   9 ( 22 )   2021.11

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    DOI: 10.1002/adom.202101048

  • Photoinduced oxygen transport in cobalt double-perovskite crystal EuBaCo2O5.39 Reviewed International journal

    Masaki Hada, Satoshi Ohmura, Tadahiko Ishikawa, Masaki Saigo, Naoya Keio, Wataru Yajima, Tatsuya Suzuki, Daisuke Urushihara, Kou Takubo, Yusuke Masaki, Makoto Kuwahara, Kenji Tsuruta, Yasuhiko Hayashi, Jiro Matsuo, Takayoshi Yokoya, Ken Onda, Fuyuki Shimojo, Muneaki Hase, Sumio Ishihara, Toru Asaka, Nobuyuki Abe, Taka-hisa Arima, Shin-ya Koshihara, Yoichi Okimoto

    APPLIED MATERIALS TODAY   24   2021.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.apmt.2021.101167

  • Achieving Thermally Activated Delayed Fluorescence from Benzophenone by Host-Guest Complexation Reviewed International journal

    Raj Kumar Koninti, Kiyoshi Miyata, Masaki Saigo, Ken Onda

    JOURNAL OF PHYSICAL CHEMISTRY C   125 ( 31 )   17392 - 17399   2021.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acs.jpcc.1c04283

  • Mechanistic study of photocatalytic CO2 reduction using a Ru(II)-Re(I) supramolecular photocatalyst Reviewed International journal

    Kei Kamogawa, Yuushi Shimoda, Kiyoshi Miyata, Ken Onda, Yasuomi Yamazaki, Yusuke Tamaki, Osamu Ishitani

    CHEMICAL SCIENCE   12 ( 28 )   9682 - 9693   2021.7

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    DOI: 10.1039/d1sc02213j

  • Determining Excited-State Structures and Photophysical Properties in Phenylphosphine Rhenium(I) Diimine Biscarbonyl Complexes Using Time-Resolved Infrared and X-ray Absorption Spectroscopies Reviewed

    Yuushi Shimoda, Kiyoshi Miyata, Masataka Funaki, Takumi Ehara, Tatsuki Morimoto, Shunsuke Nozawa, Shin-ichi Adachi, Osamu Ishitani, Ken Onda

    Inorganic Chemistry   2021.5

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    DOI: 10.1021/acs.inorgchem.1c00146

  • Mechanistic study of photocatalytic CO2 reduction using a Ru(II)–Re(I) supramolecular photocatalyst Reviewed

    2021.5

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    <p>Supramolecular photocatalysts comprising [Ru(diimine)3]2+ photosensitiser and <italic>fac</italic>-[Re(diimine)(CO)3{OC(O)OC2H4NR2}] catalyst units can be used to reduce CO2 to CO with high selectivity, durability and efficiency. In the presence of triethanolamine, the Re...</p>

    DOI: 10.1039/d1sc02213j

  • Guest-Tunable Excited States in a Cyanide-Bridged Luminescent Coordination Polymer Reviewed

    Kenta Sasaki, Haruka Yoshino, Yuushi Shimoda, Masaki Saigo, Kiyoshi Miyata, Ken Onda, Kunihisa Sugimoto, Hitomi Yamate, Hiroki Miura, Benjamin Le Ouay, Ryo Ohtani, Masaaki Ohba

    Inorganic Chemistry   2021.5

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    DOI: 10.1021/acs.inorgchem.1c00702

  • Coordination Geometrical Effect on Ligand-to-Metal Charge Transfer-Dependent Energy Transfer Processes of Luminescent Eu(III) Complexes Reviewed

    Pedro Paulo Ferreira da Rosa, Shiori Miyazaki, Haruna Sakamoto, Yuichi Kitagawa, Kiyoshi Miyata, Tomoko Akama, Masato Kobayashi, Koji Fushimi, Ken Onda, Tetsuya Taketsugu, Yasuchika Hasegawa

    The Journal of Physical Chemistry A   2021.1

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    DOI: 10.1021/acs.jpca.0c09337

  • Study of Excited States and Electron Transfer of Semiconductor‐Metal‐Complex Hybrid Photocatalysts for CO 2 Reduction by Using Picosecond Time‐Resolved Spectroscopies Reviewed

    Shunsuke Sato, Sei'ichi Tanaka, Ken‐ichi Yamanaka, Shu Saeki, Keita Sekizawa, Tomiko M. Suzuki, Takeshi Morikawa, Ken Onda

    Chemistry – A European Journal   2021.1

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    DOI: 10.1002/chem.202004068

  • Picosecond dynamics in layered cobalt perovskites studied by time-resolved Raman spectroscopy Reviewed

    22 ( S2 )   1 - 8   2021.1

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    DOI: 10.5802/crphys.35

  • Intramolecular-rotation driven triplet-to-singlet upconversion and fluctuation induced fluorescence activation in linearly connected donor–acceptor molecules Reviewed

    153 ( 20 )   204702 - 204702   2020.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/5.0029608

  • Vapor switching of the luminescence mechanism in a Re(v) complex Reviewed

    Kenta Sasaki, Hitomi Yamate, Haruka Yoshino, Hiroki Miura, Yuushi Shimoda, Kiyoshi Miyata, Ken Onda, Ryo Ohtani, Masaaki Ohba

    Chemical Communications   56 ( 85 )   12961 - 12964   2020.11

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    DOI: 10.1039/D0CC05462C

  • Dual Energy Transfer Pathways from an Antenna Ligand to Lanthanide Ion in Trivalent Europium Complexes with Phosphine-Oxide Bridges Reviewed

    Shiori Miyazaki, Kiyoshi Miyata, Haruna Sakamoto, Fumiya Suzue, Yuichi Kitagawa, Yasuchika Hasegawa, Ken Onda

    The Journal of Physical Chemistry A   2020.8

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    DOI: 10.1021/acs.jpca.0c02224

  • Liquid-like dielectric response is an origin of long polaron lifetime exceeding 10 μs in lead bromide perovskites Reviewed

    152 ( 8 )   084704 - 084704   2020.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.5127993

  • Kinetics and Mechanism of Intramolecular Electron Transfer in Ru(II)-Re(I) Supramolecular CO2-Reduction Photocatalysts: Effects of Bridging Ligands Reviewed

    Yamazaki Yasuomi, Ohkubo Kei, Saito Daiki, Yatsu Taiki, Tamaki Yusuke, Tanaka Sei'ichi, Koike Kazuhide, Onda Ken, Ishitani Osamu

    INORGANIC CHEMISTRY   58 ( 17 )   11480 - 11492   2019.9

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    Kinetics and Mechanism of Intramolecular Electron Transfer in Ru(II)-Re(I) Supramolecular CO2-Reduction Photocatalysts: Effects of Bridging Ligands

    DOI: 10.1021/acs.inorgchem.9b01256

  • Selective Reduction Mechanism of Graphene Oxide Driven by the Photon Mode versus the Thermal Mode Reviewed

    Masaki Hada, Kiyoshi Miyata, Satoshi Ohmura, Yusuke Arashida, Kohei Ichiyanagi, Ikufumi Katayama, Takayuki Suzuki, Wang Chen, Shota Mizote, Takayoshi Sawa, Takayoshi Yokoya, Toshio Seki, Jiro Matsuo, Tomoharu Tokunaga, Chihiro Itoh, Kenji Tsuruta, Ryo Fukaya, Shunsuke Nozawa, Shin-ichi Adachi, Jun Takeda, Ken Onda, Shin-ya Koshihara, Yasuhiko Hayashi, Yuta Nishina

    ACS NANO   13 ( 9 )   10103 - 10112   2019.9

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    DOI: 10.1021/acsnano.9b03060

  • Comparison of picosecond electron dynamics in isolated and clustered Si quantum dots deposited on a semiconductor surface Reviewed

    Keiki Fukumoto, Ayse Seyhan, Ken Onda, Shunri Oda, Shin-ya Koshihara

    APPLIED PHYSICS LETTERS   115 ( 5 )   2019.7

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    DOI: 10.1063/1.5097611

  • Suppression of Structural Change upon S-1-T-1 Conversion Assists the Thermally Activated Delayed Fluorescence Process in Carbazole-Benzonitrile Derivatives Reviewed

    Saigo Masaki, Miyata Kiyoshi, Tanaka Sei'ichi, Nakanotani Hajime, Adachi Chihaya, Onda Ken

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   10 ( 10 )   2475 - 2480   2019.5

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    Suppression of Structural Change upon S-1-T-1 Conversion Assists the Thermally Activated Delayed Fluorescence Process in Carbazole-Benzonitrile Derivatives

    DOI: 10.1021/acs.jpclett.9b00810

  • Direct Measurement of Intramolecular Electron Transfer in a Series of Artificial Photosynthesis Processes Reviewed

    Ken Onda, Kei Ohkubo, Yasuomi Yamazaki, Kazuhide Koike, Sei'ichi Tanaka, Osamu Ishitani

    XXI INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA 2018 (UP 2018)   205   2019.4

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    DOI: 10.1051/epjconf/201920509037

  • Optical Study of Electronic Structure and Photoinduced Dynamics in the Organic Alloy System [(EDO-TTF)(0.89)(MeEDO-TTF)(0.11)](2)PF6 Reviewed

    Ishikawa Tadahiko, Urasawa Yohei, Shindo Taiki, Okimoto Yoichi, Koshihara Shin-ya, Tanaka Seiichi, Onda Ken, Hiramatsu Takaaki, Nakano Yoshiaki, Tanaka Koichiro, Yamochi Hideki

    APPLIED SCIENCES-BASEL   9 ( 6 )   2019.3

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    Optical Study of Electronic Structure and Photoinduced Dynamics in the Organic Alloy System [(EDO-TTF)(0.89)(MeEDO-TTF)(0.11)](2)PF6

    DOI: 10.3390/app9061174

  • Investigation of excited state, reductive quenching, and intramolecular electron transfer of Ru(II)-Re(i) supramolecular photocatalysts for CO2 reduction using time-resolved IR measurements Reviewed

    Kazuhide Koike, David C. Grills, Yusuke Tamaki, Etsuko Fujita, Kei Okubo, Yasuomi Yamazaki, Masaki Saigo, Tatsuhiko Mukuta, Ken Onda, Osamu Ishitani

    Chemical Science   9 ( 11 )   2961 - 2974   2018.6

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    DOI: 10.1039/c7sc05338j

  • Novel techniques for observing structural dynamics of photoresponsive liquid crystals Reviewed

    Masaki Hada, Shohei Saito, Ryuma Sato, Kiyoshi Miyata, Yasuhiko Hayashi, Yasuteru Shigeta, Ken Onda

    Journal of Visualized Experiments   2018   2018.5

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    Novel techniques for observing structural dynamics of photoresponsive liquid crystals
    © 2018 Journal of Visualized Experiments. We discuss in this article the experimental measurements of the molecules in liquid crystal (LC) phase using the time-resolved infrared (IR) vibrational spectroscopy and time-resolved electron diffraction. Liquid crystal phase is an important state of matter that exists between the solid and liquid phases and it is common in natural systems as well as in organic electronics. Liquid crystals are orientationally ordered but loosely packed, and therefore, the internal conformations and alignments of the molecular components of LCs can be modified by external stimuli. Although advanced time-resolved diffraction techniques have revealed picosecond-scale molecular dynamics of single crystals and polycrystals, direct observations of packing structures and ultrafast dynamics of soft materials have been hampered by blurry diffraction patterns. Here, we report time-resolved IR vibrational spectroscopy and electron diffractometry to acquire ultrafast snapshots of a columnar LC material bearing a photoactive core moiety. Differential-detection analyses of the combination of time-resolved IR vibrational spectroscopy and electron diffraction are powerful tools for characterizing structures and photoinduced dynamics of soft materials.

    DOI: 10.3791/57612

  • Structural Monitoring of the Onset of Excited-State Aromaticity in a Liquid Crystal Phase Reviewed

    Masaki Hada, Shohei Saito, Sei'ichi Tanaka, Ryuma Sato, Masahiko Yoshimura, Kazuhiro Mouri, Kyohei Matsuo, Shigehiro Yamaguchi, Mitsuo Hara, Yasuhiko Hayashi, Fynn Roehricht, Rainer Herges, Yasuteru Shigeta, Ken Onda, R. J. Dwayne Miller

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   139 ( 44 )   15792 - 15800   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/jacs.7b08021

  • Ultrafast electron dynamics in twisted graphene by femtosecond photoemission electron microscopy Reviewed

    Keiki Fukumoto, Mohamed Boutchich, Hakim Arezki, Ken Sakurai, Daniela Di Felice, Yannick J. Dappe, Ken Onda, Shin-ya Koshihara

    CARBON   124   49 - 56   2017.11

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    DOI: 10.1016/j.carbon.2017.08.032

  • Structural Monitoring of the Onset of Excited-State Aromaticity in a Liquid Crystal Phase Reviewed

    Journal of the American Chemical Society   139   15792 - 15800   2017.10

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    Structural Monitoring of the Onset of Excited-State Aromaticity in a Liquid Crystal Phase

  • Photochemical Processes in a Rhenium(I) Tricarbonyl N-Heterocyclic Carbene Complex Studied by Time-Resolved Measurements Reviewed

    Tatsuhiko Mukuta, Peter V. Simpson, Jamila G. Vaughan, Brian W. Skelton, Stefano Stagni, Massimiliano Massi, Kazuhide Koike, Osamu Ishitani, Ken Onda

    INORGANIC CHEMISTRY   56 ( 6 )   3404 - 3413   2017.3

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    DOI: 10.1021/acs.inorgchem.6b02936

  • Photochemical Processes in a Rhenium(I) Tricarbonyl N-Heterocyclic Carbene Complex Studied by Time-Resolved Measurements Reviewed

    Tatsuhiko Mukuta, Peter V. Simpson, Jamila G. Vaughan, Brian W. Skelton, Stefano Stagni, Massimiliano Massi, Kazuhide Koike, Osamu Ishitani, Ken Onda

    INORGANIC CHEMISTRY   56 ( 6 )   3404 - 3413   2017.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acs.inorgchem.6b02936

  • Repeated photoswitching performance of azobenzenes adsorbed on gold surfaces: a balance between space, intermolecular interactions, and phase separation Reviewed

    Mitsuyuki Kaneta, Takumu Honda, Ken Onda, Mina Han

    NEW JOURNAL OF CHEMISTRY   41 ( 4 )   1827 - 1833   2017.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c6nj03121h

  • Structural deformation of a ring-shaped Re(I) diimine dinuclear complex in the excited state Reviewed

    Tanaka Sei'ichi, Matsubara Yoshitaka, Asatani Tsuyoshi, Morimoto Tatsuki, Ishitani Osamu, Onda Ken

    CHEMICAL PHYSICS LETTERS   662   120 - 126   2016.10

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    Structural deformation of a ring-shaped Re(I) diimine dinuclear complex in the excited state

    DOI: 10.1016/j.cplett.2016.09.006

  • Bandgap modulation in photoexcited topological insulator Bi2Te3 via atomic displacements Reviewed

    Masaki Hada, Katsura Norimatsu, Sei'ichi Tanaka, Sercan Keskin, Tetsuya Tsuruta, Kyushiro Igarashi, Tadahiko Ishikawa, Yosuke Kayanuma, R. J. Dwayne Miller, Ken Onda, Takao Sasagawa, Shin-ya Koshihara, Kazutaka G. Nakamura

    JOURNAL OF CHEMICAL PHYSICS   145 ( 2 )   9   2016.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4955188

  • Ultrafast snapshots of the molecules twisting in liquid crystal state Reviewed

    Hada M, Saito S, Tanaka S, Sato R, Matsuo K, Hara M, Hayashi Y, Mouri K, Yoshimura M, Shigeta Y, Yamaguchi S, Onda K, Miller R.J.D

    Optics InfoBase Conference Papers   2016.7

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    Ultrafast snapshots of the molecules twisting in liquid crystal state

    DOI: 10.1364/UP.2016.UTh2B.2

  • Direct Observation of the Triplet Metal-Centered State in [Ru(bpy)(3)](2+) Using Time-Resolved Infrared Spectroscopy Reviewed

    Tatsuhiko Mukuta, Sei'ichi Tanaka, Akiko Inagaki, Shin-ya Koshihara, Ken Onda

    CHEMISTRYSELECT   1 ( 11 )   2802 - 2807   2016.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/slct.201600747

  • Direct observations of the photoinduced change in dimerization in K-TCNQ Reviewed

    Ishikawa Tadahiko, Hosoda Ryosuke, Okimoto Yoichi, Tanaka Sei'ichi, Onda Ken, Koshihara Shinya, Kumai Reiji

    PHYSICAL REVIEW B   93 ( 19 )   2016.5

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    Direct observations of the photoinduced change in dimerization in K-TCNQ

    DOI: 10.1103/PhysRevB.93.195130

  • Characterization of the excited states of distal- and proximal-[Ru(tpy)(pynp)OH2](2+) in aqueous solution using time-resolved infrared spectroscopy Reviewed

    Sei'ichi Tanaka, Kosuke Takahashi, Masanari Hirahara, Masayuki Yagi, Ken Onda

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   313   87 - 98   2015.12

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    DOI: 10.1016/j.jphotochem.2015.06.018

  • Direct observation of collective modes coupled to molecular orbital-driven charge transfer Reviewed

    Tadahiko Ishikawa, Stuart A. Hayes, Sercan Keskin, Gaston Corthey, Masaki Hada, Kostyantyn Pichugin, Alexander Marx, Julian Hirscht, Kenta Shionuma, Ken Onda, Yoichi Okimoto, Shin-ya Koshihara, Takashi Yamamoto, Hengbo Cui, Mitsushiro Nomura, Yugo Oshima, Majed Abdel-Jawad, Reizo Kato, R. J. Dwayne Miller

    SCIENCE   350 ( 6267 )   1501 - 1505   2015.12

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    DOI: 10.1126/science.aab3480

  • Observation of ultrafast photoinduced dynamics in strongly correlated organic materials Reviewed

    Ken Onda

    Springer Series in Chemical Physics   112   179 - 201   2015.11

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    Observation of ultrafast photoinduced dynamics in strongly correlated organic materials
    Complex photoinduced dynamics in organic charge transfer complexes, which have strong electron correlation and low-dimensional electronic systems, have been investigated using various ultrafast analytical techniques. A short-lived hidden photoinduced phase was determined from the transient reflectivity spectrum using a 120 fs pulse over a wide photon energy range from infrared to visible. The initial process of the photoinduced dynamics and its electronic coherence were revealed using a pulse compression technique down to 12 fs. The molecular and lattice structures were found to change in a different way from the electronic states, based on observations using two types of time-resolved vibrational spectroscopy and femtosecond electron diffraction. Time-resolved photoemission electron microscopy was developed for observing transient domain structures during photoinduced phase transitions.

    DOI: 10.1007/978-3-319-23657-5_9

  • Lifetimes of photogenerated electrons on a GaAs surface affected by nanostructural defects Reviewed

    Keiki Fukumoto, Yuki Yamada, Shin-ya Koshihara, Ken Onda

    APPLIED PHYSICS EXPRESS   8 ( 10 )   2015.10

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    DOI: 10.7567/APEX.8.101201

  • Ultrafast electronic state conversion at room temperature utilizing hidden state in cuprate ladder system Reviewed

    R. Fukaya, Y. Okimoto, M. Kunitomo, K. Onda, T. Ishikawa, S. Koshihara, H. Hashimoto, S. Ishihara, A. Isayama, H. Yui, T. Sasagawa

    NATURE COMMUNICATIONS   6   2015.10

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    DOI: 10.1038/ncomms9519

  • Different Time-Scale Relaxation Dynamics in Organic Supramolecular Ferroelectrics Studied by Linear and Nonlinear Spectroscopy Reviewed

    Tsugumi Umanodan, Sei'ichi Tanaka, Suguru Naruse, Tadahiko Ishikawa, Ken Onda, Shin-ya Koshihara, Sachio Horiuchi, Yoichi Okimoto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84 ( 7 )   2015.7

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    DOI: 10.7566/JPSJ.84.073707

  • Observation of the Dark State in Ruthenium Complexes Using Femtosecond Infrared Vibrational Spectroscopy Reviewed

    Ken Onda, Tatsuhiko Mukuta, Sei'ichi Tanaka, Kei Murata, Akiko Inagaki

    ULTRAFAST PHENOMENA XIX   162   475 - 478   2015.2

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    Observation of the Dark State in Ruthenium Complexes Using Femtosecond Infrared Vibrational Spectroscopy
    Comprehensive analyses of the excited states of prototypical ruthenium complexes using time-resolved infrared vibrational spectroscopy reveal a peak that can be assigned to the dark (MC)-M-3 (metal centered) state, which plays an important role for their photofunctions.

    DOI: 10.1007/978-3-319-13242-6_116

  • Visualization of Ultrafast Electron Dynamics Using Time-Resolved Photoemission Electron Microscopy Reviewed

    K. Fukumoto, Y. Yamada, T. Matsuki, K. Onda, T. Noguchi, R. Mizokuchi, S. Oda, S. Koshihara

    ULTRAFAST PHENOMENA XIX   162   337 - 340   2015.2

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    Visualization of Ultrafast Electron Dynamics Using Time-Resolved Photoemission Electron Microscopy
    We constructed a TR-PEEM which can directly image the photo-generated electron dynamics in semiconductor on nm and fs scales. Carrier transport properties relating to device performance, carrier lifetime, drift velocity and mobility, are investigated.

    DOI: 10.1007/978-3-319-13242-6_82

  • Diverse Photoinduced Dynamics in an Organic Charge-Transfer Complex Having Strong Electron-Phonon Interactions Reviewed

    Ken Onda, Hideki Yamochi, Shin-ya Koshihara

    ACCOUNTS OF CHEMICAL RESEARCH   47 ( 12 )   3494 - 3503   2014.12

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    DOI: 10.1021/ar500257b

  • Femtosecond time-resolved photoemission electron microscopy for spatiotemporal imaging of photogenerated carrier dynamics in semiconductors Reviewed

    Keiki Fukumoto, Ken Onda, Yuki Yamada, Takashi Matsuki, Tatsuhiko Mukuta, Sei-ichi Tanaka, Shin-ya Koshihara

    REVIEW OF SCIENTIFIC INSTRUMENTS   85 ( 8 )   2014.8

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    DOI: 10.1063/1.4893484

  • Coherent dynamics of photoinduced phase formation in a strongly correlated organic crystal Reviewed

    Yoshitaka Matsubara, Sho Ogihara, Jiro Itatani, Nobuya Maeshima, Kenji Yonemitsu, Tadahiko Ishikawa, Yoichi Okimoto, Shin-ya Koshihara, Takaaki Hiramatsu, Yoshiaki Nakano, Hideki Yamochi, Gunzi Saito, Ken Onda

    PHYSICAL REVIEW B   89 ( 16 )   2014.4

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    DOI: 10.1103/PhysRevB.89.161102

  • Infrared Vibrational Spectroscopy of [Ru(bpy)(2)(bpm)](2+) and [Ru(bpy)(3)](2+) in the Excited Triplet State Reviewed

    Tatsuhiko Mukuta, Naoto Fukazawa, Kei Murata, Akiko Inagaki, Munetaka Akita, Sei'ichi Tanaka, Shin-ya Koshihara, Ken Onda

    INORGANIC CHEMISTRY   53 ( 5 )   2481 - 2490   2014.3

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    DOI: 10.1021/ic402474t

  • 実験室 卓上フェムト秒時間分解電子線回折装置の開発と光誘起構造相転移

    恩田 健, 羽田 真毅

    固体物理   49 ( 3 )   101 - 107   2014.3

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  • Direct imaging of electron recombination and transport on a semiconductor surface by femtosecond time-resolved photoemission electron microscopy Reviewed

    Keiki Fukumoto, Yuki Yamada, Ken Onda, Shin-ya Koshihara

    APPLIED PHYSICS LETTERS   104 ( 5 )   2014.2

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    DOI: 10.1063/1.4864279

  • Photochemical grafting reactions of a benzophenone-containing alkanethiol monolayer on au with deuterated polystyrene Reviewed

    Hirokazu Oda, Ken Onda, Masaru Nakagawa

    Bulletin of the Chemical Society of Japan   86 ( 9 )   1035 - 1040   2013.9

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    Photochemical grafting reactions of a benzophenone-containing alkanethiol monolayer on au with deuterated polystyrene
    Photochemical reactions of 4-[(10-sulfanyldecyl)oxy]benzophenone with deuterated polystyrene (PS-d8) were studied using Fourier-transform infrared (FT-IR) spectroscopy and vibrational sum frequency generation (VSFG) spectroscopy. The FT-IR spectral changes of PS thin films indicated that exposure to ultraviolet (UV) light caused photochemical consumption of the benzophenone moiety by a hydrogen abstraction reaction of the carbonyl group
    the reaction was almost complete at an exposure energy of 2.0 J cm-2 at 254 nm. The VSFG spectral changes of the adsorbed monolayer on Au on UV exposure revealed that the carbonyl groups oriented parallel to the Au substrate surface were consumed at more exposure energies. The exposure-energy-dependent formation of PS-grafted layers was confirmed by atomic force microscopy observations of Au surfaces modified with a photoreactive monolayer. © 2013 The Chemical Society of Japan.

    DOI: 10.1246/bcsj.20130137

  • Unconventional photonic change of charge-density-wave phase in two-leg ladder cuprate Sr14Cu24O41 Reviewed

    Ryo Fukaya, Yoichi Okimoto, Miyako Kunitomo, Tadahiko Ishikawa, Ken Onda, Shin-Ya Koshihara, Akira Isayama, Takao Sasagawa

    Journal of the Physical Society of Japan   82 ( 8 )   2013.8

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    DOI: 10.7566/JPSJ.82.083707

  • Ultrafast real space dynamics of photoexcited state in a layered perovskite-type spin crossover oxide La<inf>1.5</inf>Sr<inf>0.5</inf>CoO <inf>4</inf> Reviewed

    Yoichi Okimoto, Tsugumi Egawa, Ryo Fukaya, Yoshitaka Matsubara, Yuki Yamada, Nao Yamaya, Tadahiko Ishikawa, Ken Onda, Shin Ya Koshihara, Hiroki Taniguchi, Mitsuru Itoh, Akira Isayama, Takao Sasagawa

    Journal of the Physical Society of Japan   82 ( 7 )   2013.7

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    DOI: 10.7566/JPSJ.82.074721

  • Time-Resolved Infrared Vibrational Spectroscopy of the Photoinduced Phase Transition of Pd(dmit)(2) Salts Having Different Orders of Phase Transition Reviewed

    Naoto Fukazawa, Takahiro Tanaka, Tadahiko Ishikawa, Yoichi Okimoto, Shin-ya Koshihara, Takashi Yamamoto, Masafumi Tamura, Reizo Kato, Ken Onda

    JOURNAL OF PHYSICAL CHEMISTRY C   117 ( 25 )   13187 - 13196   2013.6

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    DOI: 10.1021/jp403193a

  • Mapping molecular motions leading to charge delocalization with ultrabright electrons Reviewed

    Meng Gao, Cheng Lu, Hubert Jean-Ruel, Lai Chung Liu, Alexander Marx, Ken Onda, Shin-ya Koshihara, Yoshiaki Nakano, Xiangfeng Shao, Takaaki Hiramatsu, Gunzi Saito, Hideki Yamochi, Ryan R. Cooney, Gustavo Moriena, German Sciaini, R. J. Dwayne Miller

    NATURE   496 ( 7445 )   343 - 346   2013.4

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    DOI: 10.1038/nature12044

  • The Earliest Stage of Photoinduced Phase Transition in a Strongly Correlated Organic System Using a 10-fs Pulse Reviewed

    Ken Onda, Yoshitaka Matsubara, Tadahiko Ishikawa, Yoichi Okimoto, Shin-ya Koshihara, Takaaki Hiramatsu, Gunzi Saito, Yoshiaki Nakano, Hideki Yamochi

    XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA   41   2013.3

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    The Earliest Stage of Photoinduced Phase Transition in a Strongly Correlated Organic System Using a 10-fs Pulse
    We examined the initial excited state before photoinduced phase transition in a charge transfer complex (EDO-TTF)(2)PF6 and revealed the conversion process to the photoinduced phase and the electronic coherence at the excited state.

    DOI: 10.1051/epjconf/20134103001

  • Photochemistry of fac-[Re(bpy)(CO)3Cl] Reviewed

    Shunsuke Sato, Yasuo Matubara, Kazuhide Koike, Magnus Falkenstroem, Tetsuro Katayama, Yukihide Ishibashi, Hiroshi Miyasaka, Seiji Taniguchi, Haik Chosrowjan, Noboru Mataga, Naoto Fukazawa, Shinya Koshihara, Ken Onda, Osamu Ishitani

    CHEMISTRY-A EUROPEAN JOURNAL   18 ( 49 )   15722 - 15734   2012.12

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    DOI: 10.1002/chem.201202734

  • Photoinduced Phase Transition in Strongly Electron-Lattice and Electron-Electron Correlated Molecular Crystals Reviewed

    Ishikawa Tadahiko, Onda Ken, Koshihara Shin-ya

    Crystals   2 ( 3 )   1067 - 1083   2012.7

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    Photoinduced Phase Transition in Strongly Electron-Lattice and Electron-Electron Correlated Molecular Crystals

    DOI: 10.3390/cryst2031067

  • Photoinduced Phase Transitions in Strongly Correlated Electron Systems Reviewed

    Shin-ya Koshihara, Shinichi Adachi, Yoichi Okimoto, Tadahiko Ishikawa, Ryo Fukaya, Keiki Fukumoto, Manabu Hoshino, Ken Onda

    2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)   2012.5

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    Photoinduced Phase Transitions in Strongly Correlated Electron Systems
    The search for materials that show a phase transition triggered by weak external stimulation of light is an important and attractive target for photonic and materials science today. My talk reviews experimental evidence indicating that photo-injected local excitation can really trigger an electron-lattice coupled cooperative phenomenon named as photo-induced phase transition (PIPT: Photo-domino effect) in wide class of materials based on the dynamical x-ray technique combined with the ultrafast spectroscopy. Obtained results also demonstrate that 'hidden phase' in strongly correlated systems which never appears in the phase diagram under thermo-equilibrium condition plays an essential role for the gigantic photo-response of the strongly correlated electron systems.

  • Probing the metal-insulator phase transition in the. DMEDO-EBDT/2PF6 single crystal by optical measurements Reviewed

    T. Ishikawa, M. Kitayama, A. Chono, K. Onda, Y. Okimoto, S. Koshihara, Y. Nakano, H. Yamochi, T. Morikawa, T. Shirahata, Y. Misaki

    JOURNAL OF PHYSICS-CONDENSED MATTER   24 ( 19 )   2012.5

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    DOI: 10.1088/0953-8984/24/19/195501

  • Charge and Structural Dynamics in Photoinduced Phase Transition of (EDO-TTF)(2)PF6 Examined by Picosecond Time-Resolved Vibrational Spectroscopy Reviewed

    Naoto Fukazawa, Minoru Shimizu, Tadahiko Ishikawa, Yoichi Okimoto, Shin-ya Koshihara, Takaaki Hiramatsu, Yoshiaki Nakano, Hideki Yamochi, Gunzi Saito, Ken Onda

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 9 )   5892 - 5899   2012.3

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    DOI: 10.1021/jp210708q

  • Femtosecond Reflection Spectroscopy in La1.5Sr0.5CoO4 Reviewed

    T. Egawa, Y. Okimoto, R. Fukaya, K. Onda, T. Ishikawa, S. -Y. Koshihara, A. Isayama, T. Sasagawa

    ACTA PHYSICA POLONICA A   121 ( 2 )   307 - 309   2012.2

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  • Ultrafast Dynamics of Photoinduced Electronic Phase Modulation in Ladder Cuprate of Sr14-xCaxCu24O41 Reviewed

    R. Fukaya, M. Kunitomo, Y. Okimoto, T. Ishikawa, K. Onda, S. Koshihara, H. Yui, T. Sasagawa

    ACTA PHYSICA POLONICA A   121 ( 2 )   310 - 312   2012.2

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  • Slow Dynamics of the Photoinduced Phase Transition in Pd(dmit)(2) Salts (dmit=1,3-dithiol-2-thione-4,5-dithiolate) Reviewed

    T. Ishikawa, T. Tanaka, N. Fukazawa, Y. Matsubara, Y. Okimoto, K. Onda, S. Koshihara, M. Tamura, R. Kato

    ACTA PHYSICA POLONICA A   121 ( 2 )   316 - 318   2012.2

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  • Search for the Photo-Induced Hidden Phase in Inorganic and Organic Systems Reviewed

    S. Koshihara, K. Onda, Y. Okimoto, T. Ishikawa

    ACTA PHYSICA POLONICA A   121 ( 2 )   328 - 331   2012.2

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    DOI: 10.12693/APhysPolA.121.328

  • Photoinduced Phase Transition in Pr0.5Ca0.5CoO3 Studied by Sequential Pulse Excitations Reviewed

    K. Seko, Y. Okimoto, M. Kurashima, R. Fukaya, T. Egawa, T. Ishikawa, K. Onda, S. -Y. Koshihara, T. Kyomen, M. Itoh

    ACTA PHYSICA POLONICA A   121 ( 2 )   369 - 371   2012.2

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  • Photoinduced Ionic to Neutral Phase Transition in TTF-CA Studied by Time-Resolved Infrared Vibrational Spectroscopy Reviewed

    Y. Matsubara, T. Yoshida, T. Ishikawa, Y. Okimoto, S. -Y. Koshihara, K. Onda

    ACTA PHYSICA POLONICA A   121 ( 2 )   340 - 342   2012.2

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  • Photo-Induced Structural Changes at a Surface of Organic Single Crystals Observed by Vibrational Sum Frequency Generation Spectroscopy Reviewed

    K. Fukumoto, N. Fukazawa, T. Ishikawa, S. Koshihara, H. M. Yamamoto, R. Kato, K. Onda

    ACTA PHYSICA POLONICA A   121 ( 2 )   313 - 315   2012.2

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  • Photoinduced Neutral-to-Ionic Phase Transition in Tetrathiafulvalene-p-chloranil Studied by Time-Resolved Vibrational Spectroscopy Reviewed

    Yoshitaka Matsubara, Yoichi Okimoto, Tatsushi Yoshida, Tadahiko Ishikawa, Shin-ya Koshihara, Ken Onda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 12 )   2011.12

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    DOI: 10.1143/JPSJ.80.124711

  • Ultrafast spectral weight transfer in RBaCo2O 6-δ (R=Sm, Gd, and Tb): Role of electronic correlation in a photoinduced phase transition Reviewed

    84 ( 12 )   2011.9

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    We performed femtosecond reflection spectroscopy on a series of A-site ordered perovskite-type cobalt oxide RBaCo2O6-δ (R=Sm, Gd, and Tb) crystals, in which the electronic transfer was controlled by R. The transient reflectivity and the optical conductivity [σPI(ω)] obtained by a Kramers-Kronig analysis showed an ultrafast change within a time resolution (150 fs) at room temperature and the appearance of signals of a hidden state that were different from the high-temperature metallic state. The transferred spectral weight in σPI(ω) upon photoexcitation sensitively depended on the R species, indicating an important role of electronic correlation in the photoexcited state. © 2011 American Physical Society.

    DOI: 10.1103/PhysRevB.84.121102

  • Acceleration of domain wall movement by photoirradiation in perovskite-type cobaltite Reviewed

    Y. Okimoto, M. Kurashima, K. Seko, T. Ishikawa, K. Onda, S. Koshihara, T. Kyomen, M. Itoh

    PHYSICAL REVIEW B   83 ( 16 )   2011.4

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    DOI: 10.1103/PhysRevB.83.161101

  • Photoinduced Dynamics of a Quasi-1D Organic Conductor over a Range from 10 fs to 100 ps Reviewed

    K. Onda, S. Ogihara, J. Itatani, T. Ishikawa, Y. Okimoto, S. Koshihara, X.F. Shao, Y. Nakano, H. Yamochi, G. Saito

    Ultrafast Phenomena XVII, Oxford University Press, New York   188 - 190   2011.2

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    Photoinduced Dynamics of a Quasi-1D Organic Conductor over a Range from 10 fs to 100 ps

  • Light-driven modulation of fluorescence color from azobenzene derivatives containing electron-donating and electron-withdrawing groups Reviewed

    Mina Han, Yasuo Norikane, Ken Onda, Yoko Matsuzawa, Masaru Yoshida, Masahiko Hara

    NEW JOURNAL OF CHEMISTRY   34 ( 12 )   2892 - 2896   2010.9

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    Light-driven modulation of fluorescence color from azobenzene derivatives containing electron-donating and electron-withdrawing groups
    We report a simple preparation and color-tunable fluorescence of a series of azobenzene derivatives. The introduction of an electron-withdrawing or electron-donating group at the X position of azobenzenes (1-8) containing a biphenyl unit makes it possible to modulate the fluorescence color of the UV-exposed azobenzene solutions from blue to yellow, which correlates with the electron-donating abilities of the respective substituents. Theoretical calculations suggest that changes in both the dihedral angles between two phenyl rings of the biphenyl unit and the dipole moments between the trans and cis forms depending on the substituents seem to be important factors in determining the photochemical properties of chromophores.

    DOI: 10.1039/c0nj00353k

  • Ultrafast and large reflectivity change by ultraviolet excitation of the metallic phase in the organic conductor (EDO-TTF)(2)PF6 Reviewed

    K. Onda, M. Shimizu, F. Sakaguchi, S. Ogihara, T. Ishikawa, Y. Okimoto, S. Koshihara, X. F. Shao, Y. Nakano, H. Yamochi, G. Saito

    PHYSICA B-CONDENSED MATTER   405 ( 11 )   S350 - S352   2010.6

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    DOI: 10.1016/j.physb.2009.11.054

  • Nanostructured TiO2 photocatalyst and pump-probe spectroscopic study Reviewed

    Wen-can Zhou, Zheng-cao Li, Zheng-jun Zhang, Ken Onda, Sho Ogihara, Yoichi Okimoto, Shin-ya Koshihara

    FRONTIERS OF MATERIALS SCIENCE   3 ( 4 )   403 - 408   2009.12

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    DOI: 10.1007/s11706-009-0055-7

  • Nanostructured TiO2 photocatalyst and pump-probe spectroscopic study Reviewed

    Wen-can Zhou, Zheng-cao Li, Zheng-jun Zhang, Ken Onda, Sho Ogihara, Yoichi Okimoto, Shin-ya Koshihara

    Frontiers of Materials Science in China   3 ( 4 )   403 - 408   2009.11

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    DOI: 10.1007/s11706-009-0055-7

  • Femtosecond time-resolved reflection spectroscopy in Pr1-xCaxMnO3 (x=0.37) Reviewed

    Xianzhou Peng, Yoichi Okimoto, Masato Endo, Ken Sato, Takeshi Aizawa, Ken Onda, Tadahiko Ishikawa, Shin-ya Koshihara, Taka-hisa Arima

    PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS   6 ( 1 )   252 - 255   2009.10

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    Femtosecond time-resolved reflection spectroscopy in Pr1-xCaxMnO3 (x=0.37)
    The ultrafast dynamics of photoinduced phase transition (PIPT) in a crystal of Pr1-xCaxMnO3 (x = 0.37) has been studied by means of femtosecond time-resolved spectroscopy. Just after photoirradiation of 1.58 eV light at 100 K, ultrafast change of reflectivity (Delta R/R) was observed within similar to 1 ps utilizing the probe light of 0.5 eV due to the ferromagnetic metallic phase transition. While the fast component of Delta R/R gradually increases with increasing the excitation intensity, the slow component observed at the delay time of similar to 1 ps shows unusual dependence on the excitation intensity. The signature of Delta R/R changes from negative to positive with the excitaiton power, which cannot be explained by the photothermal heating effect. In addition, we investigated the temperature dependence of the Delta R/R at 0.5 eV and observed the sudden change of Delta R/R around T-N, which indicates that the efficiency of PIPT is closely correlated with the ordering of spin and extra electron in Mn4+.

    DOI: 10.1002/pssc.200879884

  • Large and ultrafast photoinduced reflectivity change in the charge separated phase of Et2Me2Sb[Pd(1,3-dithiol-2-thione-4,5-dithiolate)(2)](2) Reviewed

    T. Ishikawa, N. Fukazawa, Y. Matsubara, R. Nakajima, K. Onda, Y. Okimoto, S. Koshihara, M. Lorenc, E. Collet, M. Tamura, R. Kato

    PHYSICAL REVIEW B   80 ( 11 )   2009.9

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    DOI: 10.1103/PhysRevB.80.115108

  • Ultrafast Gigantic Photo-Response in Charge-Ordered Organic Salt (EDO-TTF)(2)PF6 on 10-fs time scales Reviewed

    J. Itatani, M. Rini, A. Cavalleri, K. Onda, T. Ishikawa, S. Ogihara, S. Koshihara, X. F. Shao, Y. Nakano, H. Yamochi, G. Saito, R. W. Schoenlein

    ULTRAFAST PHENOMENA XVI   92   185 - +   2009.8

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    Ultrafast Gigantic Photo-Response in Charge-Ordered Organic Salt (EDO-TTF)(2)PF6 on 10-fs time scales
    The initial dynamics of photo-induced phase transition in charge-ordered organic salt (EDO-TTF)(2)PF6 was investigated using 10-fs near-infrared laser pulses. We observed sub-20-fs gigantic photo-responses (vertical bar Delta R/R vertical bar>100%) due to intra-molecular vibration and a clear signature of a structural bottleneck (similar to 50 fs) for the first time.

  • Ultrasonic Propagation of a Metallic Domain in Pr0.5Ca0.5CoO3 Undergoing a Photoinduced Insulator-Metal Transition Reviewed

    Y. Okimoto, X. Peng, M. Tamura, T. Morita, K. Onda, T. Ishikawa, S. Koshihara, N. Todoroki, T. Kyomen, M. Itoh

    PHYSICAL REVIEW LETTERS   103 ( 2 )   2009.7

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    DOI: 10.1103/PhysRevLett.103.027402

  • Anomalous photo-induced response by double-pulse excitation in the organic conductor (EDO-TTF)(2)PF6 Reviewed

    Ken Onda, Sho Ogihara, Tadahiko Ishikawa, Yoichi Okimoto, Xiangfeng Shao, Yoshiaki Nakano, Hideki Yamochi, Gunzi Saito, Shin-ya Koshihara

    Journal of Physics: Conference Series   148   012002   2009.3

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    Anomalous photo-induced response by double-pulse excitation in the organic conductor (EDO-TTF)(2)PF6
    We measured ultrafast reflectivity changes induced by double-pulse excitation in the organic conductor (EDO-TTF)(2)PF6. Using double-pulse excitation with a relatively high intensity, the sign of reflectivity change became reversed at around 0.8 ps and subsequently the reflectivity change reverted to that of the normal photo-induced state after about 1 ps. Using a optically phase-locked double-pulse with low intensity, we found that the temporal profile excited by an in-phase double-pulse differs from that by an out-of-phase double-pulse despite the time difference between the double-pulses being only 1.31 fs. This was true even when there is almost no overlap between each pulse in the double-pulse. These results indicate that the photo-response in this material to double-pulse excitation differs greatly from the linear sum of the responses to single pulses.

    DOI: 10.1088/1742-6596/148/1/012002

  • The future of photo-induced phase transition (PIPT)-How fast and slow it can be changed? Reviewed

    A. Tomita, S. Koshihara, S. Adachi, J. Itatani, K. Onda, S. Ogihara, Y. Nakano, H. Yamochi

    Journal of Physics: Conference Series   148   011001   2009.3

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    The future of photo-induced phase transition (PIPT)-How fast and slow it can be changed?
    The study of photo-controled nature of materials, including their optical, magnetic, and conducting properties, is a fascinating research field. The finding of photo-induced phase transition (PIPT) has triggered the search for inorganic and organic systems with highly efficient and ultrafast photo-responses. As a result of the recent progress in quantum-beam technologies, the time-resolved study of PIPT dynamics on the femto-second time scale, which is comparable with the single-cycle of phonon vibration, has become feasible. In contrast, ultra-slow dynamics on the time scales of a few seconds to several minutes play an important role in the cooperative phenomena in complex systems. Here, we review both the ultra-fast and ultra-slow dynamics of the photo-induced cooperative effects in a typical organic CT crystal (EDO-TTF)(2)PF6 and a protein molecule, myoglobin (Mb). In the case of Mb, we discuss the results from the viewpoint of a unique photo-functionality, i.e., the photo-induced transportation of a small molecule in the "super-structure" of a protein molecule.

    DOI: 10.1088/1742-6596/148/1/012066

  • Probing the photoinduced phase transition in (C2H5)(2)(CH3)(2)Sb[Pd(dmit)(2)](2) Reviewed

    N. Fukazawa, T. Ishikawa, R. Nakajima, Y. Matsubara, M. Kitayama, S. Koshihara, Y. Okimoto, K. Onda, M. Lorenc, E. Collet, M. Tamura, R. Kato

    Journal of Physics: Conference Series   148   012003   2009.3

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    Probing the photoinduced phase transition in (C2H5)(2)(CH3)(2)Sb[Pd(dmit)(2)](2)
    The dynamics of the photoinduced effect in the low temperature phase of (C2H5)(2)(CH3)(2)Sb[Pd(dmit)(2)](2) (Et2Me2Sb[Pd(dmit)(2)](2)) salt was studied by using pump-probe time resolved reflection spectroscopy with the time resolution of about 120 fs. The observed photoinduced reflectivity change was highly efficient and spectral shape of the photoinduced state was similar to that of dimer Mott insulator. In addition, oscillatory structure in photoinduced signal due to coherent phonon was observed reflecting the structural modulation coupling with valence change of the dimer state ([Pd(dmit)(2)](2)). We discuss the primary dynamics of the photoinduced phenomena in this salt at low temperature phase.

    DOI: 10.1088/1742-6596/148/1/012003

  • Photoinduced insulator-metal transition in Pr0.5Ca0.5CoO3 as studied by femtosecond spectroscopy Reviewed

    Yoichi Okimoto, Xianzhou Peng, Mieko Tamura, Takaaki Morita, Ken Onda, Tadahiko Ishikawa, Shin-ya Koshihara, Naoyuki Todoroki, Toru Kyomen, Mitsuru Itoh

    Journal of Physics: Conference Series   148   012019   2009.3

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    Photoinduced insulator-metal transition in Pr0.5Ca0.5CoO3 as studied by femtosecond spectroscopy
    Ultrafast optical response has been investigated using fs laser system on a perovskite-type cobalt oxide, Pr0.5Ca0.5CoO3 which undergoes the insulator-metal transition at 89 K. After the photo-irradiation at 30 K, the reflectivity shows a sudden increase. The ultrafast reflectance changes are quantitatively reproduced by the numerical calculation considering the linear combination of the dielectric functions of the initial insulating and the final metallic state, indicating ultrafast phase transition on the time scale of femtosecond.

    DOI: 10.1088/1742-6596/148/1/012019

  • Excitation photon energy dependence of photo-induced phase transition in (EDO-TTF)(2)PF6 Reviewed

    S. Ogihara, K. Onda, M. Shimizu, T. Ishikawa, Y. Okimoto, X. F. Shao, Y. Nakano, H. Yamochi, G. Saito, S. Koshihara

    Journal of Physics: Conference Series   148   012008   2009.3

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    Excitation photon energy dependence of photo-induced phase transition in (EDO-TTF)(2)PF6
    The conducting charge transfer complex (EDO-TTF)(2)PF6 has two types of charge transfer bands in the low temperature insulator phase: CT1 at 0.56 eV and CT2 at 1.38 eV. We excited these bands independently with a tunable ultrashort pulse laser and studied the difference of the photo-induced phases by measuring change in reflectivity spectrum over a wide photon energy range. As a result, we found that both the photo-induced phases by CT1 and CT2 excitation are the same except for their photo-conversion efficiencies

    DOI: 10.1088/1742-6596/148/1/012008

  • The photo-induced phase transition in Et(2)Me(2)Sb[Pd(dmit)(2)](2) Reviewed

    Ishikawa Tadahiko, Fukazawa Naoto, Matsubara Yoshitaka, Nakajima Ryohei, Onda Ken, Okimoto Yoichi, Koshihara Shin-ya, Tamura Masafumi, Kato Reizo, Lorenc Maciej, Collet Eric, Itoh T, Tanaka K, Schreiber M

    Physica Status Solidi C - Current Topics in Solid State Physics   6 ( 1 )   112 - 115   2008.9

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    The photo-induced phase transition in Et(2)Me(2)Sb[Pd(dmit)(2)](2)

    DOI: 10.1002/pssc.200879835

  • Photoinduced change in the charge order pattern in the quarter-filled organic conductor (EDO-TTF)(2)PF6 with a strong electron-phonon interaction Reviewed

    Ken Onda, Sho Ogihara, Kenji Yonemitsu, Nobuya Maeshima, Tadahiko Ishikawa, Yoichi Okimoto, Xiangfeng Shao, Yoshiaki Nakano, Hideki Yamochi, Gunzi Saito, Shin-ya Koshihara

    PHYSICAL REVIEW LETTERS   101 ( 6 )   2008.8

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    DOI: 10.1103/PhysRevLett.101.067403

  • The photo-induced phase and coherent phonon in the organic conductor (EDO-TTF)(2)PF6 Reviewed

    Ken Onda, Sho Ogihara, Tadahiko Ishikawa, Yoichi Okimoto, Xiangfeng Shao, Hideki Yamochi, Gunzi Saito, Shin-ya Koshihara

    JOURNAL OF PHYSICS-CONDENSED MATTER   20 ( 22 )   2008.6

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    DOI: 10.1088/0953-8984/20/22/224018

  • Ultrafast Gigantic Photo-Response in Charge-Ordered Organic Salt (EDO-TTF)(2)PF6 on 10-fs time scales Reviewed

    J. Itatani, M. Rini, A. Cavalleri, K. Onda, T. Ishikawa, S. Ogihara, S. Koshihara, X. Shao, H. Yamochi, G. Saito, R. W. Schoenlein

    1-9   3293 - +   2008.5

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    Ultrafast Gigantic Photo-Response in Charge-Ordered Organic Salt (EDO-TTF)(2)PF6 on 10-fs time scales
    The initial dynamics of photo-induced phase transition in (EDO-TTF)(2)PF6 was investigated using 10-fs laser pulses. We observed sub-20-fs gigantic photo-responses (vertical bar Delta R/R vertical bar>100%) and a clear signature of a structural bottleneck (similar to 60 fs) for the first time. (C) 2008 Optical Society of America

  • Interferometric two-photon photoemission correlation technique and femtosecond wet-electron dynamics at the TiO2 (110) surface Reviewed

    Bin Li, Jin Zhao, Min Feng, Ken Onda

    FRONTIERS OF PHYSICS IN CHINA   3 ( 1 )   26 - 40   2008.2

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    DOI: 10.1007/s11467-008-0001-7

  • Ultrafast gigantic photo-response in (EDO-TTF)(2)PF6 initiated by 10-fs laser pulses Reviewed

    Jiro Itatani, Matteo Rini, Andrea Cavalleri, Ken Onda, Tadahiko Ishikawa, Shin-ya Koshihara, Xiangfeng Shao, Hideki Yamochi, Gunzi Saito, Robert W. Shoenlein

    ULTRAFAST PHENOMENA XV   88   621 - +   2007.7

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    Ultrafast gigantic photo-response in (EDO-TTF)(2)PF6 initiated by 10-fs laser pulses
    We photo-excited a charge-ordered organic salt (EDO-TTF)(2)PF6 with sub- 10-fs optical pulses. The photo-induced metallic phase appeared within 80-fs after pumping, characterized by large changes in reflectivity (Delta R/R similar to 0.8) followed by strong coherent phonon modulation.

  • Solvated electrons on metal oxide surfaces Reviewed

    Jin Zhao, Bin Li, Ken Onda, Min Feng, Hrvoje Petek

    CHEMICAL REVIEWS   106 ( 10 )   4402 - 4427   2006.10

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    DOI: 10.1021/cr050173c

  • PHYS 215-Ultrafast electron dynamics in photocatalytic processes on single crystal TiO2(110) surfaces Reviewed

    Hrvoje Petek, Bin Li, Ken Onda, Min Feng, Jinlong Yang, Kenneth D. Jordan, Jin Zhao

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   232   2006.9

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  • Ultrafast proton-coupled electron transfer in heterogeneous photocatalysis Reviewed

    Jin Zhao, Ken Onda, Bin Li, Hrvoje Petek

    PHYSICAL CHEMISTRY OF INTERFACES AND NANOMATERIALS V   6325   2006.8

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    Ultrafast proton-coupled electron transfer in heterogeneous photocatalysis
    At metal-oxide/protic-solvent interfaces, partially hydrated or "wet electron" states represent the lowest energy pathway for electron transfer. Here we study the photoinduced charge transfer at the H2O/TiO2(110) interface by means of time-resolved two-photon photoemission spectroscopy and electronic structure theory. At similar to 1 monolayer coverage of H2O on partially hydroxylated TiO2 surfaces we find an unoccupied electronic state 2.4 +/- 0.1 eV above the Fermi level. Density functional theory shows this to be a two-dimensional "wet electron" state, which is distinct from hydrated electrons observed on water-covered metal surfaces. The decay of electrons from the wet electron state by the resonant charge transfer to the conduction band of TiO2 occurs in <= 15 femtoseconds. Similar unoccupied electronic structure is observed for CH3OH covered TiO2(110) surfaces; however, the electron dynamics are considerably more complex. The wet electron state dynamics of CH3OH/TiO2 exhibit both energy and population decay. The excited state lifetime is strongly coverage dependent increasing to > 100 fs range above 1 ML CH3OH coverage. Significantly, a pronounced deuterium isotope effect (CH3OD) indicates a strong correlation between the interfacial electron transfer and the motion of protons in the molecular overlayer.

    DOI: 10.1117/12.678279

  • Ultrafast interfacial proton-coupled electron transfer Reviewed

    B Li, J Zhao, K Onda, KD Jordan, JL Yang, H Petek

    SCIENCE   311 ( 5766 )   1436 - 1440   2006.3

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    DOI: 10.1126/science.1122190

  • The electronic structure of methanol covered TiO2(110) surfaces Reviewed

    K Onda, B Li, J Zhao, H Petek

    SURFACE SCIENCE   593 ( 1-3 )   32 - 37   2005.11

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    DOI: 10.1016/j.susc.2005.06.044

  • Femtosecond imaging of surface plasmon dynamics in a nanostructured silver film Reviewed

    A Kubo, K Onda, H Petek, ZJ Sun, YS Jung, HK Kim

    NANO LETTERS   5 ( 6 )   1123 - 1127   2005.6

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    DOI: 10.1021/nl0506655

  • Wet electrons at the H2O/TiO2(110) surface Reviewed

    K Onda, B Li, J Zhao, KD Jordan, JL Yang, H Petek

    SCIENCE   308 ( 5725 )   1154 - 1158   2005.5

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    DOI: 10.1126/science.1109366

  • Ultrafast infrared spectroscopic study of the photo-induced phase transition in (EDO-TTF)2PF6 Reviewed

    Ken Onda, Tadahiko Ishikawa, Matthieu Chollet, Shao Xiangfeng, Hideki Yamohchi, Gunzi Saito, Shin-Ya Koshihara

    Journal of Physics: Conference Series   21   216 - 220   2005.1

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    Ultrafast infrared spectroscopic study of the photo-induced phase transition in (EDO-TTF)2PF6
    We have measured ultrafast reflectivity change of (EDO-TTF) 2PF6 in the infrared region (0.51 eV - 1.03 eV) after excitation with 1.58 eV photon in order to reveal mechanism of ultra-fast photo-induced insulator-to-metal phase transition.

    DOI: 10.1109/IQEC.2005.1560823

  • Phase transition in (EDO-TTF)(2) PF6 : domain growth in the thermal hysteresis and ultra-fast photoinduced effects. Reviewed

    L Guerin, D Glijer, N Moisan, M Lorenc, M Buron-Le Cointe, E Collet, H Cailleau, A Ota, G Saito, Shao, X, H Yamochi, M Chollet, K Onda, T Ishikawa, S Koshihara

    Journal of Physics: Conference Series   21   149 - 154   2005.1

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    Phase transition in (EDO-TTF)(2) PF6 : domain growth in the thermal hysteresis and ultra-fast photoinduced effects.
    The first order phase transition between the metal (M) and insulating (I) phases of the molecular compound (EDO-TTF)(2)PF6 is investigated by single crystal X-ray diffraction. The coexistence of the insulating and metallic phases and the growth of the domains in the thermal hysteresis are clearly observed during the phase transition. We also present ultra-fast optical experiments using a nitrogen gas flow cryostat. A change of the reflectivity in the photoinduced phase was observed just after excitation. We will also discuss the influence of the excitation light polarisation on the efficiency of the photo-induced I-M phase transition.

    DOI: 10.1088/1742-6596/21/1/024

  • Imaging of localized silver plasmon dynamics with sub-fs time and nano-meter spatial resolution Reviewed

    A Kubo, K Onda, H Petek, ZJ Sun, YS Jung, HK Kim

    ULTRAFAST PHENOMENA XIV   79   645 - 649   2004.12

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    Imaging of localized silver plasmon dynamics with sub-fs time and nano-meter spatial resolution
    Images of local plasmons on a silver grating excited by 400-nm, 10-fs pulses are obtained with 50-as time and 50-nm spatial resolution. The technique is based on interferometric time-resolved two-photon photoemission and photoelectron emission microscopy.

  • Surface femtochemistry: Photocatalytic reaction dynamics of methanol/TiO2(110) Reviewed

    K Onda, B Li, H Petek

    ULTRAFAST PHENOMENA XIV   79   416 - 418   2004.12

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    Surface femtochemistry: Photocatalytic reaction dynamics of methanol/TiO2(110)
    We observe a strong charge-transfer resonance for the methanol/TiO2 (110) surface by time-resolved two-photon photoemission spectroscopy. The resonance decays in a two-component process corresponding to the charge transfer induced wave packet motion followed by solvation by the surrounding molecules.

  • Optical control of two-photon excitation efficiency of alpha-perylene crystal by pulse shaping Reviewed

    T Okada, Otake, I, R Mizoguchi, K Onda, SS Kano, A Wada

    JOURNAL OF CHEMICAL PHYSICS   121 ( 13 )   6386 - 6391   2004.10

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    DOI: 10.1063/1.1787490

  • Two-photon photoemission spectroscopy of TiO2(110) surfaces modified by defects and O-2 or H2O adsorbates Reviewed

    K Onda, B Li, H Petek

    PHYSICAL REVIEW B   70 ( 4 )   2004.7

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    Two-photon photoemission spectroscopy of TiO2(110) surfaces modified by defects and O-2 or H2O adsorbates
    Two-photon photoemission (2PP) spectra of TiO2(110) surfaces are measured for the nearly perfect surface, and surfaces modified by introduction of defects and adsorbed molecules. Defects are generated on nearly perfect surfaces by three methods: electron irradiation, annealing in vacuum, and Ar+ sputtering. Nearly perfect or damaged surfaces can be further modified by adsorption of O-2 or H2O molecules. 2PP spectroscopy is used to systematically investigate the work function change due to the presence of defects or adsorbates. 2PP spectroscopy detects both surface and bulk oxygen vacancy defects. We find from the results on oxygen adsorption that oxygen vacancies created by electron irradiation are localized on the surface and may be removed by O-2 adsorption at 100 K. The surface defects are substantially different from those created by annealing or by ion sputtering where vacancies in the subsurface region are proposed. We find that O-2 acts as an acceptor molecule on surface defect states whereas H2O acts as a donor molecule. From simulation of the work function change as a function of dosage, the dipole moment of H2O adsorbed on TiO2 surface is derived to be 0.5 D positive outward. We also find an unoccupied electronic state 2.45 eV above the Fermi level that appears at submonolayer coverage of H2O, which we tentatively assign to charge transfer from surface titanium ions to the surface-adsorbed H2O molecules or OH ligands.

    DOI: 10.1103/PhysRevB.70.045415

  • Dynamic processes of olefins adsorbed on hydroxyl groups of DM20 zeolite excited by picosecond infrared pulses: Vibrational relaxation, short-lived species and desorption Reviewed

    K Onda, K Tanabe, H Noguchi, K Domen, A Wada

    JOURNAL OF PHYSICAL CHEMISTRY B   107 ( 41 )   11391 - 11396   2003.10

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    DOI: 10.1021/jp030047h

  • Structural change of CO adsorbed on Pt(111) by laser heating: time-resolved sum-frequency generation study Reviewed

    S Katano, S Dobashi, J Kubota, K Onda, A Wada, SS Kano, K Domen

    CHEMICAL PHYSICS LETTERS   377 ( 5-6 )   601 - 606   2003.8

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    DOI: 10.1016/S0009-2614(03)01194-1

  • Thinning-out in optimized pulse shaping method using genetic algorithm Reviewed

    R Mizoguchi, K Onda, SS Kano, A Wada

    REVIEW OF SCIENTIFIC INSTRUMENTS   74 ( 5 )   2670 - 2674   2003.5

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    DOI: 10.1063/1.1569398

  • Time-resolved SFG study of formate on a Ni(111) surface under irradiation of picosecond laser pulses Reviewed

    H Noguchi, T Okada, K Onda, SS Kano, A Wada, K Domen

    SURFACE SCIENCE   528 ( 1-3 )   183 - 188   2003.3

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    DOI: 10.1016/S0039-6028(02)02630-4

  • Vibrational relaxation of adsorbate and adsorbent in the CO-adsorbed DM-20 zeolite system Reviewed

    K Onda, Y Iwasawa, A Wada

    CHEMICAL PHYSICS LETTERS   370 ( 3-4 )   437 - 442   2003.3

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    DOI: 10.1016/S0009-2614(03)00071-X

  • Second harmonic observation of Cu(111) surface: in situ measurements during molecular adsorption Reviewed

    H Ishida, R Mizoguchi, K Onda, C Hirose, SS Kano, A Wada

    SURFACE SCIENCE   526 ( 1-2 )   201 - 207   2003.2

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    DOI: 10.1016/S0039-6028(02)02651-1

  • SFG spectroscopy of CO/Ni(111): UV pumping and the transient hot band transition of adsorbed CO Reviewed

    A Bandara, SS Kano, K Onda, S Katano, J Kubota, K Domen, C Hirose, A Wada

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   75 ( 5 )   1125 - 1132   2002.5

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    DOI: 10.1246/bcsj.75.1125

  • Controlling packing structure of hydrophobic alkyl tails of monolayered films of ion-paired macrocyclic amphiphiles as studied by sum-frequency generation sepectroscopy Reviewed

    K Onda, M Nakagawa, T Asakai, R Watase, A Wada, K Ichimura, C Hirose

    JOURNAL OF PHYSICAL CHEMISTRY B   106 ( 15 )   3855 - 3859   2002.4

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    DOI: 10.1021/jp013939v

  • Time-resolved study of formate on Ni(111) by picosecond SFG spectroscopy Reviewed

    K Kusafuka, H Noguchi, K Onda, J Kubota, K Domen, C Hirose, A Wada

    SURFACE SCIENCE   502   313 - 318   2002.4

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    DOI: 10.1016/S0039-6028(01)01969-0

  • Realtime observation of the desorption process of isobutene from zeolite using picosecond infrared lasers Reviewed

    K Onda, A Wada, K Domen, C Hirose

    SURFACE SCIENCE   502   319 - 324   2002.4

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    DOI: 10.1016/S0039-6028(01)01970-7

  • Controlling packing structure of hydrophobic alkyl tails of monolayered films of ion-paired macrocyclic amphiphiles as studied by sum-frequency generation spectroscopy Reviewed

    Ken Onda, Masaru Nakagawa, Toshiaki Asakai, Reiko Watase, Akihide Wada, Kunihiro Ichimura, Chiaki Hirose

    The Journal of Physical Chemistry B   106 ( 15 )   3855 - 3859   2002.3

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    Controlling packing structure of hydrophobic alkyl tails of monolayered films of ion-paired macrocyclic amphiphiles as studied by sum-frequency generation spectroscopy

    DOI: 10.1021/jp013939v

  • Studies of the surface deuterioxyl group and adsorbed D2O on gamma-Al2O3 using picosecond infrared pump-probe spectroscopy Reviewed

    K Onda, K Tanabe, H Noguchi, A Wada, T Shido, A Yamaguchi, Y Iwasawa

    JOURNAL OF PHYSICAL CHEMISTRY B   105 ( 46 )   11456 - 11461   2001.11

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    DOI: 10.1021/jp0118625

  • Observation of unstable reaction intermediate by picosecond tunable infrared laser pulses Reviewed

    K. Domen, K. Kusafuka, A. Bandara, M. Hara, J.N. Kondo, J. Kubota, K. Onda, A. Wada, C. Hirose

    Studies in Surface Science and Catalysis   130   365 - 370   2000.12

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    Observation of unstable reaction intermediate by picosecond tunable infrared laser pulses

    DOI: 10.1016/s0167-2991(00)80984-2

  • Vibrational relaxation process of polyatomic molecules absorbed in zeolites Reviewed

    K Onda, M Yaginuma, A Wada, K Domen, C Hirose

    LASER CHEMISTRY   19 ( 1-4 )   321 - 324   1999.12

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    Vibrational relaxation process of polyatomic molecules absorbed in zeolites
    The vibrational relaxation lifetimes of the CO stretching mode of Cr(CO)(6) and Mo(CO)(6) adsorbed in the cage of the HY, DY and NaY-type zeolites were measured at various temperature by pump-probe method using picosecond infrared laser pulses. It was shown by comparing the lifetimes that the accepting modes include both the vibrational modes of the metal carbonyl and those associated with the cations on the zeolite surface. The analysis of the temperature dependence of the lifetimes revealed that the number of the excited accepting modes are four with their energy lying around 500 cm(-1).

    DOI: 10.1155/1999/60362

  • Short-lived reactive formate species on NiO(111) observed by picosecond temperature jump Reviewed

    A Bandara, J Kubota, K Onda, A Wada, K Domen, C Hirose

    SURFACE SCIENCE   433   83 - 87   1999.8

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    DOI: 10.1016/S0039-6028(99)00076-X

  • SFG study of unstable surface species by picosecond pump-probe method Reviewed

    K Domen, A Bandara, J Kubota, K Onda, A Wada, SS Kano, C Hirose

    SURFACE SCIENCE   427-28   349 - 357   1999.6

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    DOI: 10.1016/S0039-6028(99)00301-5

  • Time-resolved SFG study of the vibrational excitation of adsorbed CO on Ni(111) and NiO(111) surfaces under the irradiation of UV and visible photons Reviewed

    A Bandara, J Kubota, K Onda, A Wada, SS Kano, K Domen, C Hirose

    SURFACE SCIENCE   427-28   331 - 336   1999.6

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    DOI: 10.1016/S0039-6028(99)00298-8

  • Screening of SFG signals from bridged CO on Ni(111) by the coexistence of linear CO Reviewed

    S Katano, A Bandara, J Kubota, K Onda, A Wada, K Domen, C Hirose

    SURFACE SCIENCE   427-28   337 - 342   1999.6

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    DOI: 10.1016/S0039-6028(99)00299-X

  • Polarization characteristics from SFG spectra of clean and regulatively oxidized Ni(100) surfaces adsorbed by propionate and formate Reviewed

    T Yuzawa, T Shioda, J Kubota, K Onda, A Wada, K Domen, C Hirose

    SURFACE SCIENCE   416 ( 1-2 )   L1090 - L1094   1998.10

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    DOI: 10.1016/S0039-6028(98)00625-6

  • Picosecond infrared pump-probe spectrum of D2O adsorbed at acid OD group of zeolite Reviewed

    T Fujino, M Kashitani, K Onda, A Wada, K Domen, C Hirose, M Ishida, F Goto, SS Kano

    JOURNAL OF CHEMICAL PHYSICS   109 ( 6 )   2460 - 2466   1998.8

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    DOI: 10.1063/1.476816

  • Short-lived reactive intermediate in the decomposition of formate on NiO(111) surface observed by picosecond temperature jump Reviewed

    A Bandara, J Kubota, K Onda, A Wada, SS Kano, K Domen, C Hirose

    JOURNAL OF PHYSICAL CHEMISTRY B   102 ( 31 )   5951 - 5954   1998.7

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    DOI: 10.1021/jp9816364

  • The effect of co-adsorption of on-top CO on the sum-frequency generation signal of bridge CO on the Ni(111) surface Reviewed

    A Bandara, S Katano, J Kubota, K Onda, A Wada, K Domen, C Hirose

    CHEMICAL PHYSICS LETTERS   290 ( 1-3 )   261 - 267   1998.6

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    DOI: 10.1016/S0009-2614(98)00493-X

  • Relaxation process of CO stretching mode of metal carbonyls adsorbed on Y zeolites studied by pump-probe experiment Reviewed

    K Onda, M Yaginuma, T Yokota, A Wada, K Domen, C Hirose, SS Kano

    JOURNAL OF CHEMICAL PHYSICS   108 ( 14 )   5935 - 5941   1998.4

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    DOI: 10.1063/1.476004

  • Adsorption of CO and NO on NiO(111)/Ni(111) surface studied by infrared-visible sum frequency generation spectroscopy Reviewed

    A Bandara, S Dobashi, J Kubota, K Onda, A Wada, K Domen, C Hirose, SS Kano

    SURFACE SCIENCE   387 ( 1-3 )   312 - 319   1997.10

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    DOI: 10.1016/S0039-6028(97)00366-X

  • A TPD and SFG study of propionic acid adsorbed on Ni(110) surface Reviewed

    T Yuzawa, J Kubota, K Onda, A Wada, K Domen, C Hirose

    JOURNAL OF MOLECULAR STRUCTURE   413   307 - 312   1997.9

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    DOI: 10.1016/S0022-2860(97)00151-8

  • Experimental and theoretical exploration of photodissociation of SO2 via the (C)over-tilde(1)B(2) state: identification of the dissociation pathway Reviewed

    H Katagiri, T Sako, A Hishikawa, T Yazaki, K Onda, K Yamanouchi, K Yoshino

    JOURNAL OF MOLECULAR STRUCTURE   413   589 - 614   1997.9

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    DOI: 10.1016/S0022-2860(97)00199-3

  • PHOFEX spectroscopy of HgNe and HgAr: Determination of the dissociation energies of the X-1 Sigma(+), A(3)II(0)+, and (BII1)-I-3 states Reviewed

    T Tasaka, K Onda, A Hishikawa, K Yamanouchi

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   70 ( 5 )   1039 - 1045   1997.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1246/bcsj.70.1039

  • The effect of adsorbed noble gas atoms on vibrational relaxation of hydroxyl group in zeolite Reviewed

    T Fujino, M Furuki, M Kashitani, K Onda, J Kubota, JN Kondo, A Wada, K Domen, C Hirose, F Wakabayashi, M Ishida, F Goto, SS Kano

    JOURNAL OF CHEMICAL PHYSICS   105 ( 1 )   279 - 288   1996.7

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    DOI: 10.1063/1.471873

  • Electronic structure of metal rare gas dimers with sp configuration: Application to strong spin-orbit interaction in HgAr Reviewed

    K Onda, K Yamanouchi

    JOURNAL OF CHEMICAL PHYSICS   104 ( 23 )   9376 - 9387   1996.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.471683

  • INDUCTION OF OPTICAL-TRANSITIONS THROUGH COMPLEXATION WITHIN HG RARE-GAS VAN-DER-WAALS SYSTEMS Reviewed

    L KRIM, C JOUVET, B SOEP, K ONDA, K YAMANOUCHI, JP VISTICOT

    JOURNAL OF CHEMICAL PHYSICS   103 ( 14 )   5956 - 5963   1995.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.470475

  • INTERATOMIC POTENTIALS OF SINGLET S-RYDBERG SERIES OF A HGNE VAN-DER-WAALS DIMER - EVIDENCE FOR STABILIZATION BY SUPEREXCHANGE INTERACTION Reviewed

    K ONDA, K YAMANOUCHI

    JOURNAL OF CHEMICAL PHYSICS   102 ( 3 )   1129 - 1140   1995.1

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    DOI: 10.1063/1.469171

  • INTERATOMIC POTENTIALS OF TRIPLET S-RYDBERG SERIES OF HGNE AND HGAR VAN-DER-WAALS DIMERS Reviewed

    K ONDA, K YAMANOUCHI, M OKUNISHI, S TSUCHIYA

    JOURNAL OF CHEMICAL PHYSICS   101 ( 9 )   7290 - 7299   1994.11

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    DOI: 10.1063/1.468286

  • INTERATOMIC POTENTIAL OF THE HGNE VANDERWAALS COMPLEX IN THE E(3-SIGMA+) RYDBERG STATE Reviewed

    M OKUNISHI, K YAMANOUCHI, K ONDA, S TSUCHIYA

    JOURNAL OF CHEMICAL PHYSICS   98 ( 4 )   2675 - 2681   1993.2

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    DOI: 10.1063/1.464149

  • MECHANISM OF HYDROGENATION OF ETHYLENE VIA PHOTOPRODUCED UNSATURATED IRON CARBONYL IN THE GAS-PHASE Reviewed

    K ONDA, M TAKAHASHI, Y ISHIKAWA, K SUGITA, K TANAKA, S ARAI, DM RAYNER, PA HACKETT

    JOURNAL OF PHYSICAL CHEMISTRY   95 ( 2 )   758 - 761   1991.1

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    DOI: 10.1021/j100155a049

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Books

  • 時間分解赤外分光 : 光化学反応の瞬間を診る

    日本化学会編, 恩田健著( Role: Sole author)

    共立出版  2021.4 

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    Responsible for pages:総ページ数:ix, 183p   Language:Japanese   Book type:Scholarly book

    光と分子が関わる光化学過程は、光合成や視覚など自然界に広く存在するだけでなく、色素や発光材料、光センサーなど身近な製品の中でも重要な役割を果たしている。光化学過程は千兆分の一秒という短い時間で起こる光吸収をきっかけとして始まるため、その解析には高い時間分解能を持つ分析装置が必要となる。さらに時々刻々と変化する光化学過程を理解するためには、定常状態で起こっている熱的化学反応とは本質的に異なる考え方が必要となる。本書ではこのような光化学過程を実時間観測するための汎用的手段として時間分解赤外分光法を紹介し、さらに光化学過程を統一的に理解するための考え方を、基礎的な光と分子の相互作用の理論から丁寧に解説している。本書で扱われているテーマは、赤外振動スペクトル、分子の光吸収と発光、分子内振動エネルギー再分配、時間を含む摂動論とFermiの黄金則、無輻射遷移とエネルギーギャップ則、内部転換と項間交差、遷移状態理論、電子移動、エネルギー移動、超短パルス光の発生法と超高速分光法などである。さらに本書では参考文献として原著論文だけでなく、日本語の総説、教科書なども幅広く網羅しており、光化学、時間分解分光のレファレンスブック的な使い方も可能となっている。

Presentations

  • 時間分解分光を用いた光機能性材料の動的過程の解明 Invited

    恩田健

    第2回 再生可能資源の利用に資する固体触媒技術の動向研究会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:奈良市   Country:Japan  

  • 超高速分光を用いたセラミックス材料の動的過程の研究 Invited

    恩田健

    日本セラミックス協会2024年年会サテライトプログラム 第4回 超セラミックス 研究講演会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • 超高速時間分解分光を用いた無機・有機材料の光化学過程の解明 Invited

    恩田健

    超セラミックス:分子が拓く無機材料のフロンティア 公開シンポジウム  2024.1 

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    Event date: 2024.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都大学   Country:Japan  

  • Realtime Observation of Excited State Processes in OLED Related Materials Invited International conference

    Ken Onda

    The 14th International Conference on Optical Probes of Organic and Hybrid Semiconductors (OP2023)  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • Time-resolved Spectroscopic Studies on Fundamental Processes in Photofunctional Materials Invited International conference

    Ken Onda

    Asia Pacific Laser Symposium 2023  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: https://www.apls-2020.org/

  • Time-resolved Infrared Studies on Arylphosphine Re(I) Carbonyl Complexes International conference

    Ken Onda, Takumi Ehara, Kiyoshi Miyata, Yasuomi Yamazaki, Osamu Ishitani

    25th International Symposium on the Photochemistry and Photophysics of Coordination Compounds (ISPPCC2023)  2023.7 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

    Other Link: https://www.uni-ulm.de/isppcc/home/

  • 超短パルスレーザーと化学反応の実時間計測 Invited

    恩田健

    日本技術士会登録グループ IT21の会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • Time-resolved Spectroscopic Studies on Elementary Processes in Photofunctional Metal Complexes Invited International conference

    Ken Onda

    The 4th International Symposium on Photofunctional Chemistry of Complex Systems  2021.12 

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    Event date: 2022.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Other  

  • Time-Resolved Infrared Spectroscopic Studies of Artificial Photosynthesis Using Metal Complexes Invited International conference

    Ken Onda

    International Congress on Pure & Applied Chemistry (ICPAC Kota Kinabalu 2022)  2022.11 

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    Event date: 2022.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Malaysia  

  • 時間分解赤外分光と量子化学計算による光化学反応中間体の同定 Invited

    恩田健

    光化学応用講座2022-光化学に役立つ量子化学計算-  2022.11 

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    Event date: 2022.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  • Fundamental mechanisms of artificial photosynthesis studied by time-resolved infrared spectroscopy Invited International conference

    Ken Onda

    11th Asian Photochemistry Conference  2021.11 

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    Event date: 2021.10 - 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Other  

  • Tracking the multi-step and multi-electron CO2 reduction photocatalytic processes using time-resolved infrared spectroscopy Invited International conference

    Ken Onda, Yuushi Shimoda, Kei Kamogawa, Kiyoshi Miyata, Osamu Ishitani

    The 2021 International Chemical Congress of Pacific Basin Societies  2021.12 

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    Event date: 2021.6 - 2022.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Other  

  • (EDO-TTF)2PF6の光誘起相転移における光誘起相の性質 Invited

    恩田健

    Spring-8「分子性導体の機能・構造相関の研究と放射光利用」研究会  2007.6 

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    Country:Other  

  • 有機伝導体(EDO-TTF)2PF6における超高速光誘起ダイナミクス Invited

    恩田健

    理研シンポジウム 「分子アンサンブル2008」  2008.12 

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    Country:Other  

  • Ultrafast photoinduced phase transition in the organic conductor (EDO-TTF)2PF6 Invited

    Ken Onda

    5th Asian Conference on Ultrafast Phenomena (ACUP 2008)  2008.1 

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    Ultrafast photoinduced phase transition in the organic conductor (EDO-TTF)2PF6

  • Ultrafast photoinduced phase transition in (EDO-TTF)2PF6 Invited

    Ken Onda

    Gordon Research Conference on Ultrafast Phenomena in Cooperative Systems  2008.2 

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    Ultrafast photoinduced phase transition in (EDO-TTF)2PF6

  • Diverse photoinduced phase transitions in (EDO-TTF)2PF6 Invited

    Ken Onda

    3rd International Conference on Photo-Induced Phase Transitions and Cooperative Phenomena (PIPT2008)  2008.11 

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    Country:Other  

    Diverse photoinduced phase transitions in (EDO-TTF)2PF6

  • 固体及び固体表面における超高速光反応ダイナミクス -- 局在系から非局在系へ -- Invited

    恩田健

    平成20年度第1回強光子場科学懇談会  2009.2 

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    Country:Other  

  • ピコ秒時間分解SFG分光法による酸化物表面ダイナミクスの研究 Invited

    恩田健

    理研シンポジウム「表面・界面を観る非線形分光の新しい展開」  2009.3 

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    Country:Other  

  • Photoinduced dynamics in a quasi-1D organic conductor on the various time and space scales Invited

    2010.3 

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  • 10 fs dynamics of complex chemical systems: molecular crystals and oxide surfaces Invited

    2011.7 

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    Country:Other  

  • 非線形振動分光法の光触媒、有機電子デバイスへの応用 Invited

    恩田健

    第5回 SFG研究会  2012.3 

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    Country:Other  

  • 非線形振動分光法を用いた酸化物表面吸着種の反応ダイナミクス Invited

    恩田健

    日本表面科学会 第72回表面科学研究会「和周波発生分光法による表面・界面計測」  2012.3 

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    Country:Other  

  • Photoinduced Dynamics from 10 fs to 100 ps in Organic Strongly Correlated Systems Invited

    Ken Onda

    The 3rd Shanghai-Tokyo Advanced Research Symposium on Ultrafast Intense Laser Science (STAR3)  2012.5 

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    Country:Other  

    Photoinduced Dynamics from 10 fs to 100 ps in Organic Strongly Correlated Systems

  • 超短パルスレーザーを用いた光エネルギー変換過程の解明 Invited

    恩田健

    レーザー学会学術講演会第33回年次大会  2013.1 

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    Country:Other  

  • 分子性導体の光誘起相転移における電子と構造の異なるダイナミクス Invited

    恩田健

    分子科学研究所研究会「光による分子性伝導体の電子相制御」  2013.10 

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    Country:Other  

  • Electronic and Structural Changes over a Range from 10 fs to 100 ps in Strongly Correlated Organic Crystals Invited

    Ken Onda

    International Conference on Ultrafast Intense Laser Science (ISUILS12)  2013.10 

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    Electronic and Structural Changes over a Range from 10 fs to 100 ps in Strongly Correlated Organic Crystals

  • Different photoinduced dynamics of charge and structure in organic crystals Invited

    Ken Onda

    The 4th Shanghai-Tokyo Advanced Research Symposium on Ultrafast Intense Laser Science (STAR4)  2013.5 

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    Different photoinduced dynamics of charge and structure in organic crystals

  • Different photoinduced dynamics of charge and structure in organic crystals using time-resolved vibrational spectroscopy Invited

    Ken Onda

    Seventh International Conference on Advanced Vibrational Spectroscopy (ICAVS-7)  2013.8 

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    Country:Other  

    Different photoinduced dynamics of charge and structure in organic crystals using time-resolved vibrational spectroscopy

  • 超短パルスレーザーを用いた機能性材料の動的過程の観測 Invited

    恩田健

    第24回高温エレクトロニクス研究会  2014.3 

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    Country:Other  

  • 超短パルスレーザーによる光機能材料の実時間その場観測 Invited

    恩田健

    日本化学会 第94春期年会 特別企画講演  2014.3 

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    Country:Other  

  • 時間分解赤外分光による金属錯体のダークな励起状態の観測 Invited

    恩田健

    錯体化学第64回討論会  2014.9 

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    Country:Other  

  • 固体の動的過程を観測するための超高速分光法 Invited

    恩田健

    分光フェア2014併設分光セミナー  2014.11 

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    Country:Other  

  • Time-resolved vibrational spectroscopy for photo-functional organic materials Invited

    Ken Onda

    First Conference on Laser and Synchrotron Radiation Combination Experiment (LSC) 2014  2014.4 

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    Country:Other  

    Time-resolved vibrational spectroscopy for photo-functional organic materials

  • Time-resolved infrared spectroscopy for studying photo-energy conversion systems Invited

    Ken Onda

    2014 International Conference on Artificial Photosynthesis (ICARP 2014)  2014.11 

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    Time-resolved infrared spectroscopy for studying photo-energy conversion systems

  • Picosecond infrared spectroscopy for studying photo-functional materials Invited

    Ken Onda

    The 5th Shanghai-Tokyo Advanced Research Symposium on Ultrafast Intense Laser Science (STAR5)  2014.5 

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    Country:Other  

    Picosecond infrared spectroscopy for studying photo-functional materials

  • Photofunction of organic materials studied by time-resolved infrared vibrational spectroscopy Invited

    Ken Onda

    Photoinduced Phase Transition and Cooperative Phenomena (PIPT5)  2014.6 

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    Photofunction of organic materials studied by time-resolved infrared vibrational spectroscopy

  • 超短パルスレーザを利用した光機能性物質の動的観測 Invited

    恩田健

    応用物理学会M&BE講習会「次世代太陽エネルギー変換デバイスの研究開発を支える先端計測」  2015.11 

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    Country:Other  

  • Time-resolved Infrared Vibrational Spectroscopy for Material Science Invited

    Ken Onda

    France-Japan Workshop, Impacting Materials with Light and Electronic Fields and Watching Real Time Dynamics (IM-LED2015)  2015.11 

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    Country:Other  

    Time-resolved Infrared Vibrational Spectroscopy for Material Science

  • Photoinduced Phase Transitions Studied by Time-resolved Vibrational Spectroscopy Invited

    Ken Onda

    The Energy Materials Nanotechnology (EMN) Ultrafast Meeting  2015.11 

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    Photoinduced Phase Transitions Studied by Time-resolved Vibrational Spectroscopy

  • Photoinduced Dynamics in Solid Materials Studied by Time-resolved Vibrational Spectroscopy Invited

    Ken Onda

    9th Ultrafast Surface Dynamics (USD9)  2015.5 

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    Photoinduced Dynamics in Solid Materials Studied by Time-resolved Vibrational Spectroscopy

  • Photoinduced Dynamics in Organic Solid Materials Studied by Time-resolved Infrared Vibrational Spectroscopy Invited

    Ken Onda

    Seminar at Faculty of Physics, Adam Mickiewicz University  2015.7 

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    Photoinduced Dynamics in Organic Solid Materials Studied by Time-resolved Infrared Vibrational Spectroscopy

  • Photoenergy conversion processes studied by time-resolved infrared spectroscopy Invited

    Ken Onda

    The 2015 International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2015)  2015.12 

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    Photoenergy conversion processes studied by time-resolved infrared spectroscopy

  • Observation of charge and structure changes in photofunctional materials studied by time-resolved infrared vibrational spectroscopy Invited

    Ken Onda

    The 2015 IUPAC 48th General Assembly and 45th World Chemistry Congress (IUPAC-2015)  2015.8 

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    Observation of charge and structure changes in photofunctional materials studied by time-resolved infrared vibrational spectroscopy

  • Charge and Structure Dynamics in Organic Solid Materials Studied by Time-resolved Vibrational Spectroscopy Invited

    Ken Onda

    The 6th Shanghai-Tokyo Advanced Research Symposium on Ultrafast Intense Laser Science (STAR6)  2015.5 

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    Charge and Structure Dynamics in Organic Solid Materials Studied by Time-resolved Vibrational Spectroscopy

  • 時間分解赤外分光を用いた光機能性物質の動的過程の解明 Invited

    恩田健

    第141回OPERA研究交流セミナー兼第132回ISIT有機光エレクトロニクス研究特別室セミナー兼第199回未来化学創造センターセミナー  2016.1 

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  • Time-resolved vibrational studies on metal complexes used in solar energy conversion Invited

    Ken Onda

    2nd International Symposium on Chemical Energy Conversion Processes (ISCECP-2)  2016.5 

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    Country:Other  

    Time-resolved vibrational studies on metal complexes used in solar energy conversion

  • Non-radiative Process in Transition Metal Complexes Studied by Time-resolved Infrared Spectroscopy Invited

    Ken Onda

    The 7th Shanghai-Tokyo Advanced Research Symposium on Ultrafast Intense Laser Science (STAR7)  2016.5 

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    Non-radiative Process in Transition Metal Complexes Studied by Time-resolved Infrared Spectroscopy

  • 時間分解分光による機能性物質の動的過程の解明 Invited

    恩田健

    京都大学 物性科学センター 第15回講演会・研究交流会  2017.2 

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  • 時間分解IR法を用いた有機EL化合物の励起状態の構造解析 Invited

    恩田健

    住友化学株式会社先端材料開発研究所講演会  2017.12 

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  • Structural dynamics in photofunctional materials studied by time-resolved vibrational spectroscopy Invited

    2017.10 

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  • Structural change of TADF materials in the excited states studied by time-resolved infrared spectroscopy Invited International conference

    Ken Onda

    2nd International TADF workshop  2017.7 

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    Structural change of TADF materials in the excited states studied by time-resolved infrared spectroscopy

  • Non-radiative processes in photoenergy conversion systems studied by time-resolved infrared spectroscopy Invited International conference

    Ken Onda

    2017 International Conference on Artificial Photosynthesis (ICARP2017)  2017.3 

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    Non-radiative processes in photoenergy conversion systems studied by time-resolved infrared spectroscopy

  • Excited State Dynamics of Transition Metal Complexes Studied by Time-resolved Infrared Vibrational Spectroscopy Invited International conference

    Ken Onda

    4th Japan-Canada Joint Symposium on Coordination Chemistry  2017.11 

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    Excited State Dynamics of Transition Metal Complexes Studied by Time-resolved Infrared Vibrational Spectroscopy

  • Artificial photosynthesis processes observed by time-resolved infrared spectroscopy Invited International conference

    Ken Onda

    Japan-Italy Joint Symposium on Artificial Photosynthesis  2017.9 

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    Artificial photosynthesis processes observed by time-resolved infrared spectroscopy

  • Artificial Photosynthesis Processes Studied by Time-resolved Infrared Spectroscopy Invited International conference

    Ken Onda

    The 8th Shanghai-Tokyo Advanced Research Symposium on Ultrafast Intense Laser Science (STAR8)  2017.5 

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    Artificial Photosynthesis Processes Studied by Time-resolved Infrared Spectroscopy

  • 時間分解赤外分光を用いた機能性物質における動的構造解析 Invited

    恩田健

    北海道大学Ambitious 物質科学セミナー  2018.4 

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  • Transition Metal Complexes in the Excited States Studied by Time-resolved Infrared Vibrational Spectroscopy Invited International conference

    Ken Onda, Masaki Saigo, Kiyoshi Miyata, Tatsuhiko Mukuta, Sei'ichi Tanaka

    Post-ICCC2018 Conference in Fukuoka  2018.8 

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    Transition Metal Complexes in the Excited States Studied by Time-resolved Infrared Vibrational Spectroscopy

  • Time-resolved Vibrational Spectroscopic Studies of Structural Dynamics in Photofunctional Materials Invited International conference

    Ken Onda

    Optics & Photonics International Congress 2018 (OPIC2018) / Conference on Laser and Synchrotron Radiation Combination Experiment (LSC2018)  2018.4 

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    Time-resolved Vibrational Spectroscopic Studies of Structural Dynamics in Photofunctional Materials

  • Structural Dynamics and Photofunctions Studied by Time-Resolved Infrared Vibrational Spectroscopy Invited International conference

    Ken Onda

    The 10th Asian Conference on Ultrafast Phenomena (ACUP 2018)  2018.1 

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    Structural Dynamics and Photofunctions Studied by Time-Resolved Infrared Vibrational Spectroscopy

  • Structural Dynamics in Photofunctional Materials Studied by Time-resolved Infrared Vibrational Spectroscopy Invited International conference

    Ken Onda

    International symposium: Computational Chemistry (CC) in 14th International Conference of Computational Methods in Science and Engineering (ICCMSE2018)  2018.3 

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    Language:English  

    Country:Other  

    Structural Dynamics in Photofunctional Materials Studied by Time-resolved Infrared Vibrational Spectroscopy

  • Structural Dynamics in Organic Light-Emitting Materials Studied by Time-resolved Infrared Spectroscopy Invited International conference

    Ken Onda

    Organic Optoelectronics: Lighting Up the Future A Scotland-Japan Symposium Jointly Organized  2018.5 

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    Structural Dynamics in Organic Light-Emitting Materials Studied by Time-resolved Infrared Spectroscopy

  • Structural Dynamics in Photofunctional Materials Studied by Time-resolved Infrared Spectroscopy Invited International conference

    K. Onda, M. Saigo, K. Miyata, M. Hada

    International School and Symposium on Ultrafast Control of Materials (UCM2018)  2018.6 

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    Structural Dynamics in Photofunctional Materials Studied by Time-resolved Infrared Spectroscopy

  • Realtime Observation of Photoenergy Conversion Processes using Metal Complexes Invited International conference

    Ken Onda, Masaki Saigo, Kiyoshi Miyata, Tatsuhiko Mukuta, Sei'ichi Tanaka

    43rd International Conference on Coordination Chemistry (ICCC2018)  2018.8 

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    Realtime Observation of Photoenergy Conversion Processes using Metal Complexes

  • 時間分解赤外分光を用いた柔らかい分子結晶における光機能の解明 Invited

    恩田健

    日本化学会 第99春季年会特別企画「機能性をもつ柔らかな分子結晶の新展開」  2019.3 

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    Country:Other  

  • 時間分解赤外分光の基礎と光機能性材料開発への応用 Invited

    恩田健

    光化学応用講座2019-時間分解分光の新展開:原理から先端応用まで-  2019.12 

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    Country:Other  

  • Time-resolved Infrared Spectroscopy for Exploring Photofunctions in Softcrystals Invited International conference

    Ken Onda

    The 2nd International Symposium of Soft Crystals  2019.7 

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    Country:Other  

    Time-resolved Infrared Spectroscopy for Exploring Photofunctions in Softcrystals

  • Structural dynamics upon singlet-triplet conversion for developing efficient luminescent materials in organic light emitting diodes Invited International conference

    Ken Onda

    The 10th Shanghai-Tokyo Advanced Research Symposium on Ultrafast Intense Laser Science (STAR10)  2019.6 

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    Structural dynamics upon singlet-triplet conversion for developing efficient luminescent materials in organic light emitting diodes

  • Structural Dynamics in TADF Materials Studied by Time-resolved Infrared Spectroscopy Invited International conference

    Ken Onda

    The 3rd Frontiers of Organic Semiconductor Lasers (FOSL)  2019.1 

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    Structural Dynamics in TADF Materials Studied by Time-resolved Infrared Spectroscopy

  • Principles and applications of time-resolved infrared spectroscopy Invited International conference

    Ken Onda

    2019.9 

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    Principles and applications of time-resolved infrared spectroscopy

  • Analysis of Photofunctional Materials Using Time-resolved Infrared Spectroscopy Invited

    Ken Onda

    2020.1 

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    Analysis of Photofunctional Materials Using Time-resolved Infrared Spectroscopy

  • Structural Dynamics in Photofunctional Materials Studied by Time-resolved Infrared Spectroscopy Invited

    Ken Onda

    RIKEN CEMS Topical Meeting  2020.10 

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    Structural Dynamics in Photofunctional Materials Studied by Time-resolved Infrared Spectroscopy

  • Detailed Analysis of Emitting Processes of Emitters for OLED using Time-resolved Vibrational Spectroscopy Invited

    Ken Onda, Masaki Saigo, Yuushi Shimoda, Kiyoshi Miyata

    The 27th International Display Workshops (IDW '20)  2020.11 

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    Detailed Analysis of Emitting Processes of Emitters for OLED using Time-resolved Vibrational Spectroscopy

  • 時間分解赤外分光を用いた光機能性物質の動的構造解析 Invited

    恩田健

    レーザー学会学術講演会第41回年次大会  2021.1 

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  • 発光性希土類錯体におけるエネルギー移動機構の解明 Invited

    恩田健, 宮崎栞, 宮田潔志

    第383回蛍光体同学会講演会  2021.5 

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    Country:Other  

  • Sub-10 fs surface dynamics by time-resolved two-photon photoemission spectroscopy Invited

    2006.9 

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    Country:Other  

  • ピコ秒レーザーを用いた表面吸着種のダイナミクス Invited

    恩田健

    第17回化学反応討論会  2001.5 

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    Country:Other  

  • Realtime Observation of Chemical Reaction on a Solid Surface Invited

    Ken Onda

    7th East Asian Workshop on Chemical Dynamics (7th EAWCR)  2003.3 

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    Realtime Observation of Chemical Reaction on a Solid Surface

  • 干渉2光子光電子分光を用いた固体表面のサブ10フェムト秒光励起ダイナミクス Invited

    恩田健

    Spring-8 量子材料研究セミナー  2005.11 

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    Country:Other  

  • 有機伝導体の超高速光誘起相転移とコヒーレント制御の可能性 Invited

    恩田健

    分子科学研究所研究会「凝縮系のコヒーレント制御」  2006.3 

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  • 有機伝導体の超高速光誘起相転移とコヒーレント制御の可能性 Invited

    恩田健

    第4回超高速光エレクトロニクス研究会  2006.3 

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  • 干渉2光子相関法を用いた固体表面のsub-10フェムト秒ダイナミクス Invited

    恩田健

    第23回PFシンポジウム  2006.3 

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  • 干渉2光子パルスを用いた固体表面及び固体のダイナミクスの研究 Invited

    恩田健

    物性究所談話会  2006.3 

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    Country:Other  

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MISC

  • 時間分解赤外分光を用いた光機能性物質の動的構造解析 Reviewed

    恩田健

    レーザー研究   2022.1

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • 熱活性化遅延蛍光材料の励起状態構造ダイナミクス

    宮田 潔志, 西郷 将生, 恩田 健

    光化学 : 光化学協会会誌   2019.12

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    Language:Japanese  

  • 極小時間に生じる有機発光材料の分子変形を観測! : 第三世代有機EL材料の発光効率向上に向けて

    西郷 将生, 宮田 潔志, 恩田 健

    化学   2019.11

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    Language:Japanese  

  • 半導体表面を超高速で流れる電子を可視化 : フェムト秒レーザを利用した時間分解光電子顕微鏡の開発

    福本 恵紀, 恩田 健, 腰原 伸也

    光アライアンス   2014.10

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    Language:Japanese  

  • 不均一な環境における分子の超高速分光

    恩田 健

    分光研究   2013.10

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    Language:Japanese  

  • 光機能,光エネルギー変換材料における構造変化の実時間動画観測 : 光新素材,たんぱく質機能解明など「1兆分の1秒での有機材料の構造変化の解明」で可能になる事とは?

    恩田 健, 腰原 伸也

    2013.9

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    Language:Japanese  

  • ペロブスカイト型コバルト酸化物の示す光誘起協力現象と高速ダイナミクス (動的光物性の新展開 特集号) -- (光誘起相転移)

    沖本 洋一, 石川 忠彦, 恩田 健

    固体物理   2011.11

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    Language:Japanese  

  • A2Bタイプ電荷移動錯体における超高速絶縁体-金属光誘起相転移--光と1/4フィルドと電荷秩序が生み出した「瓢箪から駒」

    腰原 伸也, 石川 忠彦, 恩田 健

    固体物理   2006.3

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    Language:Japanese  

  • フェムト秒パルス波形探索システム

    溝口 隆一, 恩田 健, 山村 雅幸, 狩野 覚, 廣瀬 千秋, 和田 昭英

    分光研究   2000.12

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    Language:Japanese  

    DOI: 10.5111/bunkou.49.287

  • 分子誕生の瞬間

    A.H.Zewail著, 土屋荘次, 恩田健訳

    日経サイエンス   1991.2

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    Language:Others  

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Industrial property rights

Patent   Number of applications: 1   Number of registrations: 0
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • The Chemical Society of Japan

  • The Physical Society of Japan

  • 日本表面真空学会

  • 応用物理学会

  • 日本分光学会

  • 日本触媒学会

  • 分子科学会

  • 強光子場科学研究懇談会

  • 光化学協会

  • 複合系の光機能研究会

  • 有機EL討論会

  • 日本分析化学会

  • American Physical Society

  • American Chemical Society

  • 錯体化学会

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Committee Memberships

  • 日本化学会   九州支部化学教育協議会次期議長   Domestic

    2024.4 - 2025.3   

  • 日本化学会   物理化学ディビジョン副主査   Domestic

    2022.4 - 2025.3   

  • Executive   Domestic

    2022.1 - 2025.12   

  • 日本化学会   物理化学ディビジョン幹事   Domestic

    2020.4 - 2022.3   

  • Steering committee member   Domestic

    2018.9 - 2022.8   

  • Organizer   Domestic

    2018.3 - 2022.3   

  • 複合系の光機能研究会   世話人   Domestic

    2014.5 - Present   

  • Organizer   Domestic

    2011.10 - Present   

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Academic Activities

  • 創発的研究支援事業 アドバイザー

    Role(s): Review, evaluation

    科学技術振興機構  2023.9 - Present

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    Type:Scientific advice/Review 

  • 世話人 International contribution

    ( 九州大学 ) 2023.5

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    Type:Competition, symposium, etc. 

    Number of participants:50

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:14

  • 光化学協会誌

    2022.4 - 2024.3

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    Type:Academic society, research group, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:11

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:9

    Number of peer-reviewed articles in Japanese journals:1

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Research Projects

  • 先端材料化学と量子物性物理の融合による量子分子エレクトロニクスの創製

    Grant number:JP23K20039  2023 - 2029

    日本学術振興会  科学研究費助成事業  国際先導研究

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 不均一な固体環境中に置かれた分子の時間分解計測技術の開発と光化学過程の解明

    Grant number:23H01977  2023 - 2025

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 不均⼀な固体環境中に置かれた分⼦の時間分解計測技術の開発と光化学過程の解明

    Grant number:23H04631  2023 - 2025

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 広時間領域多波⻑分光による超セラミックスの動的過程の解明

    Grant number:23H04631  2023 - 2024

    日本学術振興会・文部科学省  科学研究費助成事業  学術変革領域研究(A)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 実時間状態選別的解析手段による天然および人工光合成過程の解明

    Grant number:20H05106  2020 - 2021

    日本学術振興会・文部科学省  科学研究費助成事業  新学術領域研究

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 実時間状態選別的解析手段による天然および人工光合成過程の解明

    Grant number:JP20H05106  2020 - 2021

    日本学術振興会・文部科学省  科学研究費助成事業  新学術領域研究(研究領域提案型)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 動的機能を有する物質開拓のための超高速三次元構造ダイナミクス

    Grant number:JP20H01832  2020 - 2021

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 時間分解赤外分光法を用いた有機El材料の励起状態の分子構造に関する研究

    2019.1 - 2020.1

    共同研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 有機EL材料における励起状態の構造変化の解明

    2018.2

    共同研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 各種時間分解振動分光を駆使した人工光合成過程のその場観測とメカニズムの解明

    Grant number:JP18H05170  2018 - 2019

    日本学術振興会・文部科学省  科学研究費助成事業  新学術領域研究(研究領域提案型)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 時間分解分光法を用いた化合物の構造解析

    2017.12

    共同研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • ソフトクリスタルの準安定状態創製技術の開発と相転移現象の解明

    Grant number:JP17H06375  2017 - 2021

    日本学術振興会・文部科学省  科学研究費助成事業  新学術領域研究(研究領域提案型)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 太陽光の化学エネルギーへの変換を可能にする分子技術の確立

    2017 - 2018

    戦略的創造研究推進事業 (文部科学省)

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    Authorship:Coinvestigator(s)  Grant type:Contract research

  • 新しい時間分解赤外振動分光法を用いた複雑な光エネルギー変換過程の解明

    2011 - 2016

    戦略的創造研究推進事業 (文部科学省)

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    Authorship:Principal investigator  Grant type:Contract research

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Class subject

  • 国際科学特論Ⅳ

    2024.12 - 2025.2   Winter quarter

  • 分析化学Ⅱ

    2024.10 - 2025.3   Second semester

  • 無機物質化学Ⅰ

    2024.4 - 2024.6   Spring quarter

  • 分析化学特論ⅢB

    2023.12 - 2024.2   Winter quarter

  • Advanced Analytical Chemistry ⅢB

    2023.12 - 2024.2   Winter quarter

  • 分析化学Ⅱ

    2023.10 - 2024.3   Second semester

  • 分析化学特論ⅢA

    2023.10 - 2023.12   Fall quarter

  • Advanced Analytical Chemistry ⅢA

    2023.10 - 2023.12   Fall quarter

  • 分析化学Ⅱ

    2022.10 - 2023.3   Second semester

  • 身の回りの化学

    2022.10 - 2022.12   Fall quarter

  • 分析化学特論ⅢB

    2021.12 - 2022.2   Winter quarter

  • Advanced Analytical Chemistry ⅢB

    2021.12 - 2022.2   Winter quarter

  • 基礎化学結合論Ⅱ

    2021.12 - 2022.2   Winter quarter

  • 分析化学Ⅱ

    2021.10 - 2022.3   Second semester

  • Advanced Analytical Chemistry Ⅲ(R2以前入学者用)

    2021.10 - 2022.3   Second semester

  • 分析化学特論ⅢA

    2021.10 - 2021.12   Fall quarter

  • Advanced Analytical Chemistry ⅢA

    2021.10 - 2021.12   Fall quarter

  • 基礎化学結合論Ⅰ

    2021.10 - 2021.12   Fall quarter

  • 化学特別講義Ⅳ

    2021.4 - 2022.3   Full year

  • 基礎化学

    2020.10 - 2021.3   Second semester

  • 分析化学Ⅱ

    2020.10 - 2021.3   Second semester

  • 基礎化学

    2019.10 - 2020.3   Second semester

  • 分析化学Ⅱ

    2019.10 - 2020.3   Second semester

  • Advanced Analytical Chemistry Ⅲ

    2019.10 - 2020.3   Second semester

  • 分析化学特論Ⅲ

    2019.4 - 2019.9   First semester

  • 基礎化学

    2018.10 - 2019.3   Second semester

  • 分析化学Ⅱ

    2018.10 - 2019.3   Second semester

  • 化学特別講義Ⅷ

    2018.4 - 2019.3   Full year

  • 分析化学Ⅱ

    2017.10 - 2018.3   Second semester

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FD Participation

  • 2022.7   Role:Participation   Title:電子ジャーナルに関するFD

    Organizer:Undergraduate school department

  • 2021.9   Role:Participation   Title:次世代研究者挑戦的研究プログラム 説明会

    Organizer:University-wide

  • 2021.6   Role:Participation   Title:理系研究室の運営技術ーラボラトリーマネジメントという考え方ー

    Organizer:Undergraduate school department

  • 2019.7   Role:Participation   Title:3ポリシーに関する全学FD ~日本学術会議分野別参照基準に基づく理学部物理学科の 3ポリシー~

    Organizer:University-wide

  • 2018.9   Role:Participation   Title:M2Bシステム FD

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2018.4   Role:Participation   Title:新任教員研修

    Organizer:University-wide

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Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2023  岡山大学大学院自然科学研究科  Classification:Intensive course  Domestic/International Classification:Japan 

  • 2022  東京工業大学理学院  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2022  名古屋大学大学院理学研究科  Classification:Intensive course  Domestic/International Classification:Japan 

  • 2022  東京工業大学理学院  Classification:Intensive course  Domestic/International Classification:Japan 

  • 2022  東京大学理学系研究科  Classification:Intensive course  Domestic/International Classification:Japan 

  • 2021  東京工業大学理学院  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2020  東京工業大学理学院  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2019  東京工業大学理学院  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2018  東京工業大学理学院  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2017  東京工業大学理学院  Classification:Affiliate faculty  Domestic/International Classification:Japan 

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Acceptance of Foreign Researchers, etc.

  • Univeristy of St Andrews

    Acceptance period: 2023.5 - 2023.6   (Period):2weeks to less than 1 month

    Nationality:Brazil

    Business entity:Japan Society for the Promotion of Science

  • Indian Institute of Science Education and Research (IISER) Pune

    Acceptance period: 2023.3 - 2024.5   (Period):1 month or more

    Nationality:India

    Business entity:Japan Society for the Promotion of Science

  • University of St Andrews

    Acceptance period: 2023.2 - 2023.3   (Period):2weeks to less than 1 month

    Nationality:Lithuania

    Business entity:Japan Society for the Promotion of Science

  • Acceptance period: 2019.9 - 2022.1   (Period):1 month or more

    Nationality:India

    Business entity:Japan Society for the Promotion of Science