Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Masashi Arakawa Last modified date:2023.12.15

Assistant Professor / Physical Chemistry / Department of Chemistry / Faculty of Sciences


Presentations
1. M. Arakawa, K. Kono, Y. Sekine, and A. Terasaki, Reaction of Size-Selected Iron-Oxide Cluster Cations with Methane: A Model Study of Chemical Processes in Mars’ Atmosphere, 21th International Symposium on Small Particles and Inorganic Cluster (ISSPIC XXI), 2023.09.
2. Y. Suzuki, T. Nishizato, H. Hashimoto, K. Matsumoto, R. Nomi, M. Arakawa, T. Horio, and A. Terasaki, Photoelectron imaging of icosahedral silver cluster anions doped with a group 5 metal atom: Ag12M− (M = V, Nb, and Ta), 38th Symposium on Chemical Kinetics and Dynamics, 2023.06.
3. T. Nishizato, H. Hashimoto, K. Matsumoto, M. Arakawa, T. Horio, and A. Terasaki, Exploring superatomic orbitals of AgN− and AgNM− (M = Sc-Ni) by photoelectron imaging, The Symposium on Size-Selected Clusters S3C, 2023.02.
4. M. Arakawa, M. Horioka, K. Minamikawa, T. Kawano, and A. Terasaki, Reaction kinetics of NO on Agn+ and AgnM+ (M = Sc–Ni): Size- and dopant-dependent reaction pathways, The Symposium on Size-Selected Clusters S3C, 2023.03.
5. 河村駿, 河野聖, 山口雅人, 荒川雅, 堀尾琢哉, 寺嵜亨, サイズ選別銀クラスター負イオン3–11量体の光吸収過程:電子脱離と解離の競合, 第16回分子科学討論会, 2022.09.
6. 飯田岳史, 荒川雅, 堀尾琢哉, 寺嵜亨, 真空下における水滴の蒸発冷却過程:Whispering Gallery Modeの波長測定による液滴直径計測, 第16回分子科学討論会, 2022.09.
7. M. Arakawa, M. Horioka, K. Minamikawa, T. Kawano, and A. Terasaki, Reaction kinetics of nitric oxide molecules on silver cluster cations: Size-dependent reaction pathways, International Congress on Pure & Applied Chemistry Kota Kinabalu (ICPAC Kota Kinabalu 2022), 2022.11.
8. 松本一陽, 西里将, 橋本治暉, 南川賢人, 荒川雅, 堀尾琢哉, 寺嵜亨, Koopmansの定理に基づく銀クラスター負イオンの垂直電子脱離エネルギー:長距離補正密度汎関数理論による予測確度の向上, 第16回分子科学討論会, 2022.09.
9. 西里将, 橋本治暉, 松本一陽, 南川賢人, 荒川雅, 堀尾琢哉, 寺嵜亨, 銀および遷移金属添加銀クラスター負イオンの光電子イメージング:超原子2S軌道の可視化と理論的検証, 第16回分子科学討論会, 2022.09.
10. T. Nishizato, K. Minamikawa, H. Hashimoto, K. Matsumoto, M. Arakawa, T. Horio, and A. Terasaki, Exploring superatomic orbitals of size-selected silver cluster anions by photoelectron imaging, 37th Symposium on Chemical Kinetics and Dynamics, 2022.06.
11. K. Minamikawa, T. Nishizato, H. Hashimoto, K. Matsumoto, M. Arakawa, T. Horio, and A. Terasaki, Photoelectron imaging spectroscopy of Sc-doped silver cluster anions, 37th Symposium on Chemical Kinetics and Dynamics, 2022.06.
12. T. Horio, K. Minamikawa, T. Nishizato, M. Arakawa, and A. Terasaki, Photoelectron imaging of metal cluster anions using a continuous wave laser source, 36th Symposium on Chemical Kinetics and Dynamics, 2021.06.
13. S. Kono, S. Kawamura, K. Morishita, M. Arakawa, T. Horio, A. Terasaki, Structural Features in the Growth of Silver Cluster Cations Observed by Photodissociation/Absorption Spectroscopy, The 101th CSJ Annual Meeting, 2021.03.
14. K. Minamikawa, M. Arakawa, K. Tono, A. Terasaki, Electronic Structures of Cobalt-doped Silver Cluster Anions, AgNCo, Revisited: Refined Analysis of Photoelectron Spectra in Light of Chemical Reactivity, The 100th CSJ Annual Meeting, 2020.03.
15. T. Hayakawa, M. Arakawa, A. Terasaki, Oxidation-state measurement by X-ray absorption spectroscopy on size-selected clusters of cerium oxide and its derivatives, The 76th Fujihara Seminar: International Workshop on Designer Nanocluster Materials -From Gas Phase to Condensed Pase-, 2019.10.
16. K. Minamikawa, N. Hayashi, M. Arakawa, A. Terasaki, Exploring electronic and geometric structures of both cationic and anionic transition-metal-doped silver clusters via reaction with dioxygen, The 76th Fujihara Seminar: International Workshop on Designer Nanocluster Materials -From Gas Phase to Condensed Pase-, 2019.10.
17. S. Kono, M. Arakawa, A. Terasaki, Cluster growth in the magnetron-sputtering cluster source studied by optical emission spectroscopy, The 76th Fujihara Seminar: International Workshop on Designer Nanocluster Materials -From Gas Phase to Condensed Pase-, 2019.10.
18. M. Arakawa, G. Naresh Patwari, A. Terasaki, The origin of composition of group 5 meetal nitrides as revealed by successive nitridation of tantalum cluster cations by NH3 molecules, The 76th Fujihara Seminar: International Workshop on Designer Nanocluster Materials -From Gas Phase to Condensed Pase-, 2019.10.
19. M. Arakawa and A. Terasaki, Elementary processes in chemical evolution studied by size-selected cluster chemistry, The 23rd East Asian Workshop on Chemical Dynamics (EAWCD), 2019.09, Size-selected clusters in the gas phase provide us with an ideal approach to elucidate how the chemical and physical properties of matter appear as atoms associate together one by one toward bulk solids and liquids. For example, we are studying silver clusters to show emergence of collective excitation of electrons in the course of cluster growth into a nanoparticle by optical absorption spectroscopy. X-ray absorption spectroscopy has been employed to investigate chemical state of each constituent atom in the cluster ion.  Furthermore, reaction experiments on gas-phase clusters offer opportunities to probe reactions step by step with precise control in the number of atoms and molecules involved in the reaction as a model for bulk chemical processes.  Here we present two topics focusing on size-selected cluster chemistry.
The first topic is tantalum nitride, which is an attractive material with a potential for various applications, e.g., copper diffusion barriers in microelectronics, an interlayer in magnetic random-access memories, and photocatalysts for H2 evolution from water under visible light. Elucidation of nitridation mechanism at the molecular level would supply a useful recipe for fabricating high-quality tantalum-nitride materials. In the present study, nitridation of tantalum cluster cations, Tan+ (n = 1–10), by ammonia molecules is investigated,7 since it is known that nitridation does not take place by N2. The reaction of the monomer cation, Ta+, with two NH3 molecules leads to formation of TaN2H2+ along with release of two H2 molecules. The dehydrogenation occurs until the formal oxidation number of Ta reaches +5. On the other hand, all the tantalum clusters, Tan+, react with two NH3 molecules and form TanN2+ after release of three H2 molecules. Further exposure to ammonia showed that TanNmH+ and TanNm+ are produced through successive reactions; a pure nitride and three H2 molecules are formed for every other NH3 molecule. The nitridation occurred until the formal oxidation number of Ta reaches +5 as in the case of TaN2H2+ in contrast to other group 5 elements, i.e., vanadium and niobium, which have been reported to produce nitrides with lower oxidation states.9,10 The present results on small gas-phase clusters show correlation with their bulk properties: tantalum is known to form bulk nitrides in the oxidation states of either +5 (Ta3N5) or +3 (TaN), whereas vanadium and niobium form nitrides in the oxidation state of +3 (VN and NbN).  Along with DFT calculations, these findings reveal that nitridation is driven by the electron-donating ability of the metal, i.e., electronegativity of the metal plays a key role in determining the composition of nitrides..
20. M. Arakawa and A. Terasaki, Reaction of gas-phase metal and mineral clusters with H2O, CO, and H2 molecules related to chemistry in space, International Congress on Pure & Applied Chemistry Yangon (ICPAC Yangon 2019), 2019.08, Small particles and clusters of minerals such as silicate (e.g., (Mg,Fe)SiO3 and (Mg,Fe)2SiO4) and silica (SiO2) as well as metals such as iron and cobalt, are among the most abundant materials in space. It is prevalent hypothesis that, in the early stage of planetary formation, such materials contribute to chemical processes such as water delivery to the Earth and formation of organic molecules. Size-selected gas-phase clusters provide a good model for this chemistry, because it is possible to investigate reactions step by step with precise control in the number of atoms and molecules involved in the reaction. In this context, we present reactions of gas-phase free silicate, MglSiOm−, and silica, SinOm−, cluster anions with CO, and H2O molecules, to investigate chemical processes during the early stage of planetary formation. Furthermore, coadsorption of CO and H2 molecules on cobalt cluster cations, Con+, will be presented to discuss formation of organic molecules on the cluster..
21. Masashi Arakawa, G. Naresh Patwari, Akira Terasaki, The origin of bulk-nitride composition of group 5 metals as revealed by nitridation of tantalum cluster cations by ammonia molecules, International Congress on Pure & Applied Chemistry Langkawi (ICPAC Langkawi 2018), 2018.10.
22. M. Arakawa, K. Ando, S. Fujimoto, S. Mishra, G. Naresh Patwari, and A. Terasaki, Successive nitridation of tantalum cluster cations by ammonia molecules: The origin of bulk-nitride composition of group 5 metals, 19th International Symposium on Small Particles and Inorganic Cluster (ISSPIC XIX), 2018.08, Tantalum nitride is an attractive material with a potential for various applications, e.g., copper diffusion barriers in microelectronics, an interlayer in magnetic random access memories, and photocatalysts for H2 evolution. Elucidation of nitridation mechanism of tantalum at the molecular level would supply a useful recipe for fabricating high-quality tantalum-nitride materials. In this context, gas-phase clusters provide an ideal approach to probe reactions step by step with precise control in the number of atoms and molecules involved in a reaction [1,2]. In the present study, nitridation of free tantalum cation, Ta+, and tantalum cluster cations, Tan+, by ammonia molecules is investigated [3], since it is known that nitridation does not proceed by nitrogen molecules [4].
In the experiment, Tan+ (n = 1–10) was generated by a magnetron-sputter cluster-ion source. They were mass-selected and guided into a reaction cell filled with NH3 molecules. The ions produced by the reaction were identified by a quadrupole mass analyzer.
The reaction of monomer cation, Ta+, with two molecules of NH3 leads to formation of TaN2H2+ along with release of two H2 molecules. The dehydrogenation occurs until the formal oxidation number of the tantalum atom reaches +5. On the other hand, all the tantalum cluster cations, Tan+, react with two molecules of NH3 and form TanN2+ with the release of three H2 molecules. Further exposure to ammonia showed that TanNmH+ and TanNm+ are produced through successive reactions; a pure nitride and three H2 molecules are formed for every other NH3 molecule. The nitridation occurred until the formal oxidation number of tantalum atoms reaches +5 as in the case of TaN2H2+. These reaction pathways of tantalum atom and cluster cations are in contrast to those of other group 5 elements, i.e., vanadium and niobium cluster cations, which have been reported to produce nitrides with lower oxidation states [5,6]. The present results on nitridation of small clusters illustrate correlation with their bulk properties: Tantalum is known to form bulk nitrides in the oxidation states of either +5 (Ta3N5) or +3 (TaN), whereas vanadium and niobium form only an oxidation state of +3 (VN and NbN) [7]. Along with DFT calculations, these findings reveal that electronegativity of the metal (V > Nb > Ta) plays a key role in determining the composition of metal nitrides. In contrast to nitrides, all of vanadium, niobium and tantalum form most stable oxides in the oxidation state of +5 due to high electronegativity of oxygen compared with nitrogen. The present study thus revealed that electronegativity of group 5 metal is crucial for nitridation..
23. M. Arakawa, G. Naresh Patwari, and A. Terasaki, Nitridation mechanism of tantalum cluster cations by ammonia molecules: contrast to other group 5 metals, Gas Phase Model Systems for Catalysis – GPMC 2018, 2018.06, Tantalum nitride is an attractive material with a potential for various applications such as photocatalysts for H2 evolution from water and copper diffusion barriers in microelectronics. Elucidation of nitridation mechanism of tantalum at the molecular level would supply a useful recipe for fabricating high-quality tantalum-nitride materials. In the present study, reactions of free tantalum cation, Ta+, and tantalum cluster cations, Tan+, with ammonia molecules were investigated to probe nitridation reactions step by step with precise control in the number of atoms and molecules involved in the reaction [1].
In the experiment, Tan+ (n = 1–10) was generated by a magnetron-sputter cluster-ion source. They were thermalized through collisions with helium molecules cooled by liquid nitrogen, and were mass-selected and guided into a reaction cell filled with NH3 molecules. The ions produced by the reaction were identified by a quadrupole mass analyzer, and the yield of each reaction product was measured as a function of the cluster size, n.
The reaction of monomer cation, Ta+, with two molecules of NH3 leads to formation of TaN2H2+ along with release of two H2 molecules. The dehydrogenation occurs until the formal oxidation number of the tantalum atom reaches +5. On the other hand, all the tantalum cluster cations, Tan+, react with two molecules of NH3 and form TanN2+ with the release of three H2 molecules. Further exposure to ammonia showed that TanNmH+ and TanNm+ are produced through successive reactions; this is achieved by alternate single and double dehydrogenation upon adsorption of every other NH3 reactant molecule. The nitridation occurred until the formal oxidation number of tantalum atoms reaches +5 as in the case of TaN2H2+. These reaction pathways of tantalum atom and cluster cations are in contrast to those of other group 5 metals, i.e., vanadium and niobium clusters, which have been reported to produce nitrides with lower oxidation states [2,3]. The present results on nitridation of small clusters of group 5 metals illustrate correlation with their bulk properties: Tantalum is known to form bulk nitrides in the oxidation states of either +5 (Ta3N5) or +3 (TaN), whereas vanadium and niobium form only an oxidation state of +3 (VN and NbN) [4]. Along with DFT calculations, these findings reveal that nitridation is driven by the electron-donating ability of the group 5 element, i.e., electronegativity of the metal plays a significant role in determining the composition of metal nitrides..
24. M. Arakawa, Application of cluster chemistry to astrochemistry: Molecular evolution involving mineral clusters, Kaleidoscope: A Discussion Meeting in Chemistry, 2018.07.
25. K. Minamikawa, M. Horioka, T. Kawano, M. Arakawa, A. Terasaki, Size-Dependent Reactivity of Transition-Metal-Doped Silver Cluster Ions: Effects of Geometric and Electronic Structures, Asian Symposium on Nanoscience and Nanotechnology 2018 "Fundamentals and applications of Nanoclusters and Nanoparticles", 2018.05.
26. M. Arakawa, K. Ando, S. Fujimoto, S. Mishra, G. Naresh Patwari, A. Terasaki, Nitridation mechanism of tantalum clusters by ammonia molecules: The origin of bulk-nitride composition of group 5 metals, Asian Symposium on Nanoscience and Nanotechnology 2018, 2018.05.
27. Masashi Arakawa, Reaction of silicate clusters related to chemistry in the interstellar environment, International Symposium on Molecular Science -Physical Chemistry/ Theoretical Chemistry, Chemoinformatics, Computational Chemistry-,, 2018.03.
28. Masashi Arakawa, Akira Terasaki, Adsorption and subsequent reaction of carbon monoxide and water molecules on silica and silicate cluster anions, Symposium "Evolution of Molecules in Space", 2017.06.
29. 荒川 雅, 寺嵜 亨, Generation and Reaction of Mineral Clusters Related to Chemistry in the Interstellar Environment, 日本化学会 第97春季年会, 2017.03.
30. 安東 航太 , 荒川 雅, 寺嵜 亨, Freezing process of a water droplet evaporatively cooled in a vacuum, 日本化学会 第97春季年会, 2017.03.
31. Masashi Arakawa, Akira Terasaki, Reaction of silicate clusters with CO and H2O as a model study of chemistry in the interstellar environment, 18th International Symposium on Small Particles and Inorganic Clusters, 2016.08.
32. Shun Sarugaku, Masashi Arakawa, Akira Terasaki, Jumpei Matsumoto, Tomoki Kawano, Size-specific reactivity of transition-metal-doped silver clusters toward oxygen: Geometric and electronic effects, 18th International Symposium on Small Particles and Inorganic Clusters, 2016.08.
33. Yuya Kiyomura, Kenichiro Tobita, Tomonori Ito, Masashi Arakawa, Akira Terasaki, Optical absorption spectra of size-selected silver cluster cations: Size and temperature dependence, 18th International Symposium on Small Particles and Inorganic Clusters, 2016.08.
34. Kota Ando, Masashi Arakawa, Akira Terasaki, Liquid droplets in a vacuum for wet chemistry of gas-phase clusters, 18th International Symposium on Small Particles and Inorganic Clusters, 2016.08.
35. Kota Ando, Masashi Arakawa, Akira Terasaki, Freezing process of a supercooled water droplet in a vacuum, International Symposium: Recent Progress in Molecular Spectroscopy and Dynamics, 2016.07.
36. Shun Sarugaku, Jumpei Matsumoto, Tomoki Kawano, Masashi Arakawa, Akira Terasaki, Size-specific reactivity of transition-metal-doped silver clusters with an oxygen molecule, International Symposium: Recent Progress in Molecular Spectroscopy and Dynamics, 2016.07.
37. Yuya Kiyomura, Kanichiro Tobita, Tomonori Ito, Masashi Arakawa, Akira Terasaki, Size- and temperature-dependent optical absorption spectra of silver cluster cations, International Symposium: Recent Progress in Molecular Spectroscopy and Dynamics, 2016.07.
38. Masashi Arakawa, Akira Terasaki, Reaction MglSinOm- with CO and H2O molecules: a model study of chemistry in the intestellar environments, International Symposium: Recent Progress in Molecular Spectroscopy and Dynamics, 2016.07.
39. 荒川 雅, Generation and reaction of clusters with mineral compositions: a model study of chemistry in the interstellar environment, Seminar at Department of Chemistry, Indian Institute of Technology , 2016.04.
40. Masashi Arakawa, Ryo Yamane, Akira Terasaki, Reaction site of a CO molecule on silicon-oxide cluster anions, Symposium on Size Selected Clusters, 2016.02.
41. Akira Terasaki, Kenichiro Tobita, Yuya Kiyomura, Tomonori Ito, Masashi Arakawa, Optical absorption of size-selected free silver cluster ions in the size range up to 35, Symposium on Size Selected Clusters, 2016.02.
42. Masashi Arakawa, Ryo Yamane, Akira Terasaki, Adsorption of a CO molecule on silicon-oxide cluster anions toward elucidation of reaction processes on mineral surfaces in proto-planetary nebulae, PACIFICHEM 2015, 2015.12.
43. Kcnichiro Tobita, Yuya Kiyomura, Tomonori Ito, Masashi Arakawa, Akira Terasaki, Photodissociation spectroscopy of silver cluster cations up to 35 atoms: Size and temperature dependence of spectral profiles, PACIFICHEM 2015, 2015.12.
44. Shun Sarugaku, Masashi Arakawa, Akira Terasaki, Chemical reactivity of silver-cobalt binary cluster ions: Effects of geometric and electronic structures, PACIFICHEM 2015, 2015.12.
45. Kota Ando, Masashi Arakawa, Akira Terasaki, Trapping a liquid micro-droplet in a vacuum toward wet chemistry of gas-phase clusters, PACIFICHEM 2015, 2015.12.
46. Masashi Arakawa, Ryo Yamane, Akira Terasaki, Reaction sites of a CO molecule on silicon-oxide cluster anions as a model of mineral surfaces, Workshop on Nanoscale Atomic and Molecular Systems, 2015.08.
47. Masashi Arakawa, Kei Kohara, Akira Terasaki, Formation of hydrated-alumina clusters toward elucidation of generation process of organic molecules on mineral surfaces, Workshop on Interstellar Matter, 2014.10.
48. Masashi Arakawa, Kei Kohara, Akira Terasaki, Reaction of aluminum cluster cations with a mixture of O2 and H2O gases: Formation of hydrated-alumina clusters, 17th International Symposium on Small Particles and Inorganic Cluster, 2014.09.
49. Tetsuichiro Hayakawa, Masashi Arakawa, Shun Sarugaku, Kota Ando, Kenichiro Tobita, Tomonori Ito, Kazuhiro Egashira, Akira Terasaki, X-ray absorption spectroscopy of size-selected cerium oxide clusters, 17th International Symposium on Small Particles and Inorganic Cluster, 2014.09.
50. Shun Sarugaku, Masashi Arakawa, Akira Terasaki, Space-focusing of spatially spread ions in time-of-flight mass spectrometer, 17th International Symposium on Small Particles and Inorganic Cluster, 2014.09.
51. Tomonori Ito, Ken-ichiro Tobita, Masashi Arakawa, Akira Terasaki, Photodepletion spectroscopy of silver cluster cations in a temperature-controlled ion trap, 17th International Symposium on Small Particles and Inorganic Cluster, 2014.09.
52. Kota Ando, Masashi Arakawa, Akira Terasaki, Generation of a liquid droplet in a vacuum, 17th International Symposium on Small Particles and Inorganic Cluster, 2014.09.
53. Tomonori Ito, Kenichiro Tobita, Masashi Arakawa, Akira Terasaki, Photodissociation spectra of isolated silver cluster cations: size and temperature dependence, 30th Symposium on chemical kinetics and dynamics, 2014.06.
54. Masashi Arakawa, Kei Kohara, Akira Terasaki, Dissociation, oxidation, hydroxylation, and hydration of aluminum cluster cations upon reaction with H2O and O2, Gas Phase Model Systems for Catalysis – GPMC 2014, 2014.04.
55. Masashi Arakawa, Kei Kohara, Akira Terasaki, Formation of stable aluminum hydroxide clusters in aluminum-cluster ion beam exposed to O2 and H2O, Trombay Symposium on Radiation and Photochemistry, 2014.01.
56. Tetsuichiro Hayakawa, Kazuhiro Egashira, Masashi Arakawa, Tomonori Ito, Shun Sarugaku, Kota Ando, Akira Terasaki, X-ray spectroscopy of size-selected free metal-oxide clusters for oxidation-state analysis, Asian Consortium on Computational Materials Science, 2014.01.
57. Kei Kohara, Masashi Arakawa, Tomonori Ito, Akira Terasaki, Reaction of size-selected aluminum cluster cations toward H2O and O2: Formation of stable products, Workshop on Fundamentals and Applications of Laser Filaments, 2013.04.
58. Tomonori Ito, Yuki Taniguchi, Masashi Arakawa, Akira Terasaki, Sequential adsorption of nitrogen molecules on size-selected silver cluster cations, Workshop on Fundamentals and Applications of Laser Filaments, 2013.04.
59. Shun Sarugaku, Masashi Arakawa, Akira Terasaki, Improvement of Wiley-McLaren-type time-of-flight mass spectrometer for continuous ion beam, Workshop on Fundamentals and Applications of Laser Filaments, 2013.04.
60. Kota Ando, Masashi Arakawa, Akira Terasaki, Liquid micro-droplet formation in a vacuum, Workshop on Fundamentals and Applications of Laser Filaments, Workshop on Fundamentals and Applications of Laser Filaments, 2013.04.
61. Size Dependent Reaction of Aluminum Cluster Cations with Water Molecules.
62. Reactivity of size-selected aluminum cluster cations with water molecules.
63. Adsorption process of nitrogen on silver cluster cations.
64. Hydrogen ordering in ice observed from neutron diffraction: Application to planetary science.