| 1. |
Kohei Oda, Takuro Tsutsumi, Srihari Keshavamurthy, Kenji Furuya, P. B. Armentrout, and Tetsuya Taketsugu, Dynamically Hidden Reaction Paths in the Reaction of CF3+ + CO, ACS Phys. Chem. Au, https://doi.org/10.1021/acsphyschemau.2c00012, 2022.05, Reaction paths on a potential energy surface are widely used in quantum chemical studies of chemical reactions. The recently developed global reaction route mapping (GRRM) strategy automatically constructs a reaction route map, which provides a complete picture of the reaction. Here, we thoroughly investigate the correspondence between the reaction route map and the actual chemical reaction dynamics for the CF3+ + CO reaction studied by guided ion beam tandem mass spectrometry (GIBMS). In our experiments, FCO+, CF2+, and CF+ product ions were observed, whereas if the collision partner is N2, only CF2+ is observed. Interestingly, for reaction with CO, GRRM predicted reaction paths leading to the CF+ + F2CO product channel are found at a barrier height of about 2.5 eV, whereas the experimentally obtained threshold for CF+ formation was 7.48 +- 0.15 eV. In other words, the ion was not obviously observed in the GIBMS experiment even unless a much higher collision energy than the requisite energy threshold was given. On-the-fly molecular dynamics simulations revealed a mechanism that hides these reaction paths, in which a non-statistical energy distribution at the first collisionally reached transition state prevents the reaction from proceeding along some reaction paths. Our results highlight the existence of dynamically hidden reaction paths that may be inaccessible in experiments at specific energies and hence the importance of reaction dynamics in controlling the destinations of chemical reactions..  |
| 2. |
Lu Zhang, Shi-Chao Qi, Keita Iwanaga, Kazuhiro Uemura, Li-Xin Zhang, Shinji Kudo, Jun-ichiro Hayashi, KENJI FURUYA, Koyo Norinaga, An Approach for On-line analysis of Multi-component Volatiles from Coal Pyrolysis with Li＾+-attachment Ionization Mass Spectrometry, Fuel Processing Technology, https://doi.org/10.1016/j.fuproc.2016.12.001, 158, 141-145, 2017.04, Ion-attachment mass spectrometry (IAMS) is a technique used for measuring easily ionized organic compounds in a non-fragmenting mode by softly attaching a Li+ or another type of alkaline ion to the gaseous molecule. In this study, a prototype device for Li+ IAMS is developed for real-time quantitative monitoring of the vapor produced from thermochemical conversion of coal. Simulated tar vapor containing a suite of aromatics and the real vapor produced from the pyrolysis of coal are monitored by IAMS with a Li+ source. It is confirmed that both the simulated and real vapors are ionized without undergoing fragmentation and the sensitivities of these detected aromatic molecules are similar to one another. In addition, when the feeding rate of the coal sample is changed from 0.5 to 1.0 g/min, the peak intensities increase nearly twice as much. These results show the possibility of applying IAMS to the quantitatively monitoring of coal-derived volatiles.. |
| 3. |
KEISUKE NOGAMI, YASUHIRO SAKAI, SHOTA MINETA, DAIJI KATO, IZUMI MURAKAMI, HIROYUKI A. SAKAUE, TAKAHIRO KENMOTSU, KENJI FURUYA, KENJI MOTOHASHI, Level-energy-dependent mean velocities of excited tungsten atoms sputtered by krypton-ion bombardment, Journal of Vacuum Science & Technology A, http://dx.doi.org/10.1116/1.4928250, 33, 061602, 2015.08, Visible emission spectra were acquired from neutral atoms sputtered by 35–60 keV Kr+ ions from a polycrystalline tungsten surface. Mean velocities of excited tungsten atoms in seven different 6p states were also obtained via the dependence of photon intensities on the distance from the surface. The average velocities parallel to the surface normal varied by factors of 2–4 for atoms in the different 6p energy levels. However, they were almost independent of the incident ion kinetic energy. The 6p-level energy dependence indicated that the velocities of the excited atoms were determined by inelastic processes that involve resonant charge exchange.. |
| 4. |
Kenji Furuya, Akihiro Ide, Akira Harata, Mass spectrometric investigation of high-mass neutral species in the downstream region of Ar/CH4 plasmas, Journal of Applied Physics, 10.1063/1.3605543, 110, 1, 013304, 2011.07, Mass analysis was carried out on neutral species in the downstream region of Ar/CH4 plasmas. The ionization of the neutral species by Li+ attachment, which can inhibit the fragmentation accompanied by ionization in most cases, successfully led to the observation of high-mass neutral hydrocarbons containing up to twenty-seven carbon atoms. Pure Ar and Ar/H2 plasmas were also used to investigate the influence of sputtering of an amorphous hydrocarbon (a-C:H) film deposited during the generation of the Ar/CH4 plasmas. In addition, time dependence of intensity in several neutral species accompanied by the growth of the a-C:H film and its CH4 partial pressure dependence were observed for the first time. On the basis of the present experimental results, the desorption of high-mass neutral molecules from the film to the gas phase is concluded.. |
| 5. |
Decomposition of cellulose dissolved in ionic liquid using gas-liquid interface discharge. |
| 6. |
Hiroshi Okumura, Kenji Furuya and Akira Harata, Growth of neutral species in the downstream region of perfluorocarbon plasmas, J. Plasma Fusion Res. Series, 8, 705-710, 2009.09. |
| 7. |
Yuji Tamai, Hiroshi Okumura, Kenji Furuya and Akira Harata, Mass spectrometric analysis of chemical species in the downstream region of Ar/CF4/H2 plasmas, J. Plasma Fusion Res. Series, 8, 1361-1365, 2009.09. |
| 8. |
Hiroshi Okumura, Kenji Furuya and Akira Harata, Growth of fluorocarbon macromolecules in the gas phase: IV. Li+-attachment mass spectrometric investigation of high-mass neutral radicals in the downstream region of Ar/c-C4F8 plasmas, Journal of Physics D: Applied Physics, 42 (6), 065205 (8 pages), 2009.03. |
| 9. |
Kenji Furuya, Akihiro Ide, Hiroshi Okumura, and Akira Harata, Mass spectrometric investigation and formation mechanisms of high-mass species in the downstream region of Ar/CF4/O2 plasmas, Physical Chemistry and Chemical Physics, 11 (6), pp.934-942, 2009.02. |
| 10. |
Kenji Furuya, Hiroshi Okumura, Yuji Tamai, Akihiro Ide, and Akira Harata, Li+ attachment mass spectrometric investigation of high-mass neutral species in the downstream region of Ar/CF4, Ar/CF4/O2 and Ar/CF4/H2 plasmas, Bulletin of American Physical Society, 53 (10), p.71, 2008.10. |
| 11. |
Kenji Furuya, Ryoichi Nakanishi, Hiroshi Okumura, Makoto Makita, and Akira Harata, Influence of substrate type on surface structure of polymeric perfluorocarbon in the initial stage of deposition in Ar/c-C4F8 plasmas, Thin Solid Films, 516 (18), pp.6028-6032, 2008.02. |
| 12. |
Kenji Furuya, Yuko Hirowatari, Toshio Ishioka, and Akira Harata, Protective Agent-free Preparation of Gold Nanoplates and Nanorods in Aqueous HAuCl4 Solutions Using Gas-Liquid Interface Discharge, Chemistry Letters, 36 (9), pp.1088-1089, 2007.09. |
| 13. |
Kenji Furuya, Ryoichi Nakanishi, Makoto Makita, and Akira Harata, Surface Structure and Chemical Bonding of Polymeric Perfluorocarbon in the Initial Stage of Deposition in Ar/c-C4F8 plasmas, 24th Symposium on Plasma Processing (SPP-24), pp.245-246, 2007.01. |
| 14. |
Kenji Furuya, Shinobu Yukita, and Akira Harata, Growth of fluorocarbon macromolecules in the gas phase: II. The growth mechanisms of large positive ions observed in the downstream region of Ar/CF4 plasmas, Jpn. J. Appl. Phys., 45 (6A) pp.5219-5231, 2006.06. |
| 15. |
Kenji Furuya, Sinobu Yukita, Hiroshi Okumura, Akira Harata, Mass Spectrometric Investigation of Perfluorocarbon Macromolecules in the Downstream Region of Ar/CF4 Plasmas and the Formation Mechanisms of Large Positive Ions, 6th International Conference on Reactive Plasmas and 23rd Symposium on Plasma Processing, pp.391-392, 2006.01. |
| 16. |
古屋謙治、雪田忍、奥村洋史、中西良一、蒔田慎、原田明, Growth of gaseous macromolecules downstream in perfluorocarbon plasmas and its application to thin film formation, Plasma Science Symposium 2005/The 22nd Symposium on Plasma Processing, pp.623-624, 2005.02. |
| 17. |
Kenji Furuya, Shinobu Yukita, Hiroshi Okumura, and Akira Harata, Growth of fluorocarbon macromolecules in a gas phase (I). Mass spectrometric investigation of products in the downstream region of Ar/CF4 plasmas, Chem. Lett., 10.1246/cl.2005.224, 34, 2, 224-225, 34 (2) 224-225, 2005.02. |
| 18. |
Kenji Furuya and Yoshihiko Hatano, Quantitative Analysis of CF4 Produced in the SiO2 Etching Process Using c-C4F8, C3F8, and C2F6 Plasmas by In Situ Mass Spectrometry, Jpn. J. Appl. Phys., 10.1143/JJAP.43.342, 43, 1, 342-346, 43 (1) 342-346, 2004.01. |
| 19. |
Kenji Furuya, Youhei Shimoida, Kouhei Matsuo, Yoshihiko Hatano, Contribution of the 4p sublevel to the Balmer-b emission intensity from H(n = 4) produced in electron-H2, CHF3, CH4 and C3H8 collisions as studied by photon-photon coincidence experiments, Chem. Phys., 10.1016/j.chemphys.2003.09.018, 295, 3, 229-234, 2003.01. |
| 20. |
Kenji Furuya and Yoshihiko Hatano, Pulse height distribution of output signals in the positive ion detection by a microchannel plate, Int. J. Mass Spectrom., 2002.01. |
| 21. |
Kenji Furuya, Akihiro Matsuo, and Teiichiro Ogawa, The production of CO+(A 2P) from dissociative ionization of CO2. A fragment ion-photon coincidence spectroscopic investigation, J. Phys. B: At. Mol. Opt. Phys., 10.1088/0953-4075/35/14/305, 35, 14, 3077-3086, 2002.01. |
| 22. |
Kenji Furuya, Kouhei Matsuo, Eri Koto, Kouichiro Maruyama, Yoshihiko Hatano, and Teiichiro Ogawa, Fragment ion-photon coincidence investigation of trifluoromethane by controlled electron impact, J. Phys. B: At. Mol. Opt. Phys., 10.1088/0953-4075/35/4/323, 35, 4, 1015-1024, 2002.01. |
| 23. |
Kenji Furuya, Eri Koto, and Teiichiro Ogawa, Fragment ion-photon coincidence investigation of carbon tetrafluoride by controlled electron impact, J. Phys. B: At. Mol. Opt. Phys., 10.1088/0953-4075/34/8/306, 34, 8, 1405-1413, 2001.01. |
| 24. |
Kenji Furuya, Kouichiro Maruyama, Eri Koto, Akihiro Matsuo, and Teiichiro Ogawa, Fragment ion-photon coincidence (FIPCO) study of dissociative ionization accompanying light emission by electron impact on acetylene, J. Phys. B: At. Mol. Opt. Phys., 2000.01. |
| 25. |
Kenji Furuya, Kaname Ishikawa, and Teiichiro Ogawa, Mass analysis of polyatomic high-Rydberg fragments produced by electron impact on methane, Chem. Phys. Lett., 10.1016/S0009-2614(00)00149-4, 319, 3-4, 335-340, 2000.01. |
| 26. |
Eri Koto, Kenji Furuya, and Teiichiro Ogawa, Direct observation of intramolecular vibrational energy redistribution under white light excitation II: Fluorescence spectra of fluorobenzene derivatives by controlled electron impact, Spectrochim. Acta A, 10.1016/S1386-1425(99)00142-0, 56, 3, 515-521, 2000.01. |
| 27. |
Kenji Furuya, Kaname Ishikawa, Akihiro Matsuo, and Teiichiro Ogawa, Mass analysis of high-Rydberg fragments produced by electron impact on ethane by use of a pulsed-field-ionization technique, Chem. Phys. Lett., 10.1016/S0009-2614(99)01101-X, 313, 3-4, 559-564, 1999.01. |
| 28. |
Kenji Furuya, Eri Koto, Takeshi Ueda, Kouichiro Maruyama, Akihiro Matsuo, and Teiichiro Ogawa, Fragment ion-photon coincidence (FIPCO) measurements by electron impact on ethylene and the Monte Carlo simulation of the band shape, J. Phys. B: At. Mol. Opt. Phys., 10.1088/0953-4075/32/13/307, 32, 13, 3167-3182, 1999.01. |
| 29. |
Akihiro Matsuo, Kenji Furuya, and Teiichiro Ogawa, Dissociative ionization accompanying emission by electron impact on N2O using Fragment Ion-Photon Coincidence (FIPCO) measurements, Chem. Phys., 10.1016/S0301-0104(98)00429-7, 242, 1, 91-101, 242 (1) pp.91-101, 1999.01. |
| 30. |
Kenji Furuya, Hirofumi Hayakawa, Akihiro Matsuo, and Teiichiro Ogawa, Translational energy distributions of excited CH+ ions produced by electron impact on methane, J. Phys. B: At. Mol. Opt. Phys., 10.1088/0953-4075/32/3/007, 32, 3, 621-629, 1999.01. |
| 31. |
Kenji Furuya, Eri Koto, Takeshi Ueda, Kouichiro Maruyama, and Teiichiro Ogawa, Correlation between CH(A) and H+ produced by dissociative ionization of ethylene, Chem. Phys. Lett., 10.1016/S0009-2614(98)00367-4, 288, 5-6, 816-820, 1998.01. |
| 32. |
Akihiro Matsuo, Kenji Furuya, and Teiichiro Ogawa, A new band of O+ observed in measurements of angle-resolved translational energy by electron impact on O2, Chem. Phys. Lett., 10.1016/S0009-2614(98)00203-6, 287, 5-6, 653-658, 1998.01. |
