Keiichi Yokoyama

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Name
Keiichi Yokoyama
Affiliation
Japan Atomic Energy Agency

Published Papers

 
Kobayashi Takanori, Matsuoka Leo, Yokoyama Keiichi
JOURNAL OF THE JAPAN INSTITUTE OF ENERGY   96(10) 441-444   Oct 2017   [Refereed]
Kurosaki Yuzuru, Yokoyama Keiichi
CHEMICAL PHYSICS   493 183-193   Aug 2017   [Refereed]
Kobayashi Takanori, Yokoyama Keiichi
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   53(10) 1489-1493   2016   [Refereed]
小林 孝徳, 橋本 雅史, 横山 啓一
JAEA-research   2015(14) 巻頭1-2,1-7   Dec 2015
Ichihara Akira, Matsuoka Leo, Segawa Etsuo, Yokoyama Keiichi
PHYSICAL REVIEW A   91(4)    Apr 2015   [Refereed]
Ichihara Akira, Matsuoka Leo, Kurosaki Yuzuru, Yokoyama Keiichi
OPTICAL REVIEW   22(1) 153-156   Feb 2015   [Refereed]
Kurosaki Yuzuru, Akagi Hiroshi, Yokoyama Keiichi
PHYSICAL REVIEW A   90(4)    Oct 2014   [Refereed]
An Analytic Formula for Describing the Transient Rotational Dynamics of Diatomic Molecules in an Optical Frequency Comb
Ichihara Akira, Matsuoka Leo, Kurosaki Yuzuru, Yokoyama Keiichi
CHINESE JOURNAL OF PHYSICS   51(6) 1230-1240   Dec 2013   [Refereed]
Leo Matsuoka, Keiichi Yokoyama
Journal of Computational and Theoretical Nanoscience   10 1617-1620   Jul 2013
We propose an approximate physical implementation of non-coined discrete-time quantum walk (DTQW), which is a class of quantum cellular automata. We regard a molecular rotational state as a node of the quantum walk, and implement unitary operation...
2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)      2013   [Refereed]
2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)      2013   [Refereed]
2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)      2013   [Refereed]
Kurosaki Yuzuru, Yokoyama Keiichi
JOURNAL OF CHEMICAL PHYSICS   137(17)    Nov 2012   [Refereed]
Kurosaki Yuzuru, Yokoyama Keiichi
COMPUTATIONAL AND THEORETICAL CHEMISTRY   999 239-245   Nov 2012   [Refereed]
Kurosaki Yuzuru, Yokoyama Keiichi
JOURNAL OF CHEMICAL PHYSICS   137(6)    Aug 2012   [Refereed]
Yokoyama Keiichi
LASER-DRIVEN RELATIVISTIC PLASMAS APPLIED TO SCIENCE, ENERGY, INDUSTRY, AND MEDICINE   1465 65-68   2012   [Refereed]
Matsuoka Leo, Hashimoto Masashi, Yokoyama Keiichi
LASER-DRIVEN RELATIVISTIC PLASMAS APPLIED TO SCIENCE, ENERGY, INDUSTRY, AND MEDICINE   1465 58-62   2012   [Refereed]
Leo Matsuoka, Masashi Hashimoto, Keiichi Yokoyama
Optics InfoBase Conference Papers   1363-1364   Dec 2011
We developed a Ti:Sapphire narrow-band regenerative amplifier for molecular spectroscopy. The gain bandwidth of the regenerative cavity was narrowed to ~0.7 cm-1 by three birefringence filters and a plate of etalon. With 1.1-mJ pumping by the seco...
Matsuoka Leo, Kasajima Tatsuya, Hashimoto Masashi, Yokoyama Keiichi
JOURNAL OF THE KOREAN PHYSICAL SOCIETY   59(4) 2897-2900   Oct 2011   [Refereed]
Kurosaki Yuzuru, Ichihara Akira, Yokoyama Keiichi
JOURNAL OF CHEMICAL PHYSICS   135(5)    Aug 2011   [Refereed]
Kurosaki Yuzuru, Yokoyama Keiichi, Yokoyama Atsushi
COMPUTATIONAL AND THEORETICAL CHEMISTRY   963(2-3) 245-255   Feb 2011   [Refereed]
Kasajima Tatsuya, Yokoyama Keiichi, Matsuoka Leo, Yokoyama Atsushi
CHEMICAL PHYSICS LETTERS   485(1-3) 45-48   Jan 2010   [Refereed]
Kurosaki Yuzuru, Yokoyama Keiichi, Yokoyama Atsushi
JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM   913(1-3) 38-42   Nov 2009   [Refereed]
Kurosaki Yuzuru, Yokoyama Keiichi, Yokoyama Atsushi
JOURNAL OF CHEMICAL PHYSICS   131(14)    Oct 2009   [Refereed]
Hosaka Kouichi, Itakura Ryuji, Yokoyama Keiichi, Yamanouchi Kaoru, Yokoyama Atsushi
CHEMICAL PHYSICS LETTERS   475(1-3) 19-23   Jun 2009   [Refereed]
Matsuoka Leo, Yokoyama Keiichi, Yokoyama Atsushi
PHYSICAL REVIEW A   79(6)    Jun 2009   [Refereed]
H. Akagi, H. Ohba, K. Yokoyama, A. Yokoyama, K. Egashira, Y. Fujimura
Applied Physics B: Lasers and Optics   95 17-21   Apr 2009
We have proposed a laser isotope separation method, utilizing rotational coherence of a simple molecule. In the scheme, photoexcited molecules are isotopically separated by difference of rotational period between them. To illustrate this method, t...
Yokoyama Atsushi, Katsumata Keiichi, Ohba Hironori, Akagi Hiroshi, Saeki Morihisa, Yokoyama Keiichi
JOURNAL OF PHYSICAL CHEMISTRY A   112(29) 6571-6577   Jul 2008   [Refereed]
Kurosaki Yuzuru, Matsuoka Leo, Yokoyama Keiichi, Yokoyama Atsushi
JOURNAL OF CHEMICAL PHYSICS   128(2)    Jan 2008   [Refereed]
Sugita Akihiro, Yokoyama Keiichi, Yamada Hidetaka, Inoue Norihiro, Aoyama Makoto, Yamakawa Koichi
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46(1) 226-228   Jan 2007   [Refereed]
H. Yamada, H. Yamada, K. Yokoyama, K. Yokoyama, Y. Teranishi, A. Sugita, T. Shirai, M. Aoyama, Y. Akahane, N. Inoue, H. Ueda, K. Yamakawa, A. Yokoyama, M. Kawasaki, H. Nakamura
Physical Review A - Atomic, Molecular, and Optical Physics   72    Dec 2005
A demonstration of coherent quantum control for ultrafast precise selection of closely-lying states is reported. A phase-locked pair of femtosecond laser pulses is generated through a pulse shaper to excite the ground-state cesium atom to the Cs(7...
Hiroshi Akagi, Hiroshi Fukazawa, Keiichi Yokoyama, Atsushi Yokoyama
Journal of Chemical Physics   123    Nov 2005
Exclusively selective OD bond dissociation of HOD has been demonstrated by the ultraviolet photodissociation at 243.1 nm through the fourth overtone state of the OD stretching mode (5 ł3bd;OD). Branching ratio between the OH and OD bond dissociati...
Hiroshi Akagi, Keiichi Yokoyama, Atsushi Yokoyama, Akira Wada
Journal of Molecular Spectroscopy   231 37-49   May 2005
Absorption spectra of gaseous samples containing NH2D and NHD2have been measured in the 11 580-11 880 and 15 280-15 610 cm-1regions, corresponding to the 5νNDand 5νNHvibrational bands, respectively. Photoacoustic spectroscopy has been utilized for...
Yuzuru Kurosaki, Keiichi Yokoyama, Yoshiaki Teranishi
Chemical Physics   308 325-334   Jan 2005
A total of ∼1200 trajectories have been integrated for the two photodissociation channels of formic acid, HCOOH→H2O+CO (1) and HCOOH→CO2+H2(2), which occur with 248 and 193 nm photons, using the direct ab initio molecular dynamics method at the RM...
K. Yokoyama, Y. Teranishi, Y. Toya, T. Shirai, Y. Fukuda, M. Aoyama, Y. Akahane, N. Inoue, H. Ueda, K. Yamakawa, A. Yokoyama, H. Yamada, A. Yabushita, A. Sugita
Journal of Chemical Physics   120 9446-9449   May 2004
Optimal laser control for ultrafast selection of closely lying excited states, whose energy separation was smaller than the laser bandwidth, was applied on the two-photon transition of atomic cesium. Selective oxidation was carried out using pulse...
Hiroshi Akagi, Keiichi Yokoyama, Atsushi Yokoyama
Journal of Chemical Physics   120 4696-4704   Mar 2004
A crossed laser and molecular beams method was used to investigate the ultraviolet photodissociation of NHD2excited to the fourth overtone state of the NH stretching mode and NH2D excited to that of the ND stretching mode. A (2+1) resonance enhanc...
Sven Neukermans, Ewald Janssens, Hiromasa Tanaka, Roger E. Silverans, Peter Lievens, Keiichi Yokoyama, Hiroshi Kudo
Journal of Chemical Physics   119 7206-7213   Oct 2003
Resonance-enhanced two-photon ionization spectroscopy on the hypervalent Li3O molecule at room temperature was carried out, resulting in an experimental photoabsorption spectrum with four broad absorption bands in the energy range between 0.7 and ...
Yuzuru Kurosaki, Keiichi Yokoyama
Chemical Physics Letters   371 568-575   Apr 2003
A total of 400 trajectories for the photodissociation, CH3CHO → CH3+ HCO, on the T1potential surface have been calculated using the direct ab initio molecular dynamics method at the UB3LYP/cc-pVDZ level of theory. It was predicted that the product...
Hiroshi Akagi, Keiichi Yokoyama, Atsushi Yokoyama
Journal of Chemical Physics   118 3600-3611   Feb 2003
The photodissociation of highly vibrationally excited NH3in the fourth overtone vibrational band of the N-H stretching mode was discussed. Franck-Condon (FC) factors for the transitions from the two vibrational states were evaluated by utilizing t...
Yuzuru Kurosaki, Keiichi Yokoyama
Journal of Physical Chemistry A   106 11415-11421   Nov 2002
A total of 100 trajectories for the photodissociation, CH3CHO → CH4 + CO, on the S0 potential surface have been calculated using the direct ab initio molecular dynamics method at the RMP2(full)/cc-pVDZ level of theory. The energy distributions for...
Naoki Haketa, Keiichi Yokoyama, Hiromasa Tanaka, Hiroshi Kudo
Journal of Molecular Structure: THEOCHEM   577 55-67   Jan 2002
The structure, stability and ionization energy of the LinFn-1(n = 2-5) clusters were studied theoretically using a density functional theory-based method at the B3LYP level and an ab initio molecular orbital theory calculation at the MP2 level wit...
Keiichi Yokoyama, Hiromasa Tanaka, Hiroshi Kudo
Journal of Physical Chemistry A   105 4312-4315   May 2001
The structure of a hyperlithiated molecule has been deduced from an experiment for the first time. An analysis of the photoionization efficiency curve measured by laser-ablation time-of-flight mass spectrometry has revealed that the hyperlithiated...
Keiichi Yokoyama, Atsushi Yokoyama, Toshiyuki Takayanagi
Journal of Chemical Physics   114 1624-1630   Jan 2001
Using a two-dimensional potential energy surfaces constructed by ab initio CASSCF calculations, a wave packet propagation on two diabatic surface coupled to each other confirmed the occurrence of simultaneous triple dissociation of CBrClF2to give ...
Hiromasa Tanaka, Keiichi Yokoyama, Hiroshi Kudo
Journal of Chemical Physics   114 152-159   Jan 2001
The photoionization time of flight mass spectrometry was used to measure the ionization efficiency curves (IEC) of the lithium hydroxide clusters. The Franck-Condon simulation was used to identify the global minimum structure of the clusters predi...
Atsushi Yokoyama, Keiichi Yokoyama, Toshiyuki Takayanagi
Journal of Chemical Physics   114 1617-1623   Jan 2001
The dissociation mechanism and dynamics of CBrClF2following the σ*(C-Cl)←n(Cl) transition were studied using photofragment translational spectroscopy. It was found that the CBrClF2molecules dissociated competitively through C-Cl bond rupture, C-Br...
Hironobu Umemoto, Naoki Terada, Kunikazu Tanaka, Toshiyuki Takayanagi, Yuzuru Kurosaki, Keiichi Yokoyama
Chemical Physics   262 499   Dec 2000
Keiichi Yokoyama, Naoki Haketa, Hiromasa Tanaka, Katsutoshi Furukawa, Hiroshi Kudo
Chemical Physics Letters   330 339-346   Nov 2000
Ionization energies (IEs) of hyperlithiated Li2F molecule and non-stoichiometric LinFn-1(n=3,4) clusters detected in a pulsed supersonic cluster beam expanded from a laser-ablation source are reported for the first time. The IEs determined by phot...
Hironobu Umemoto, Naoki Terada, Kunikazu Tanaka, Toshiyuki Takayanagi, Yuzuru Kurosaki, Keiichi Yokoyama
Chemical Physics   259 39-47   Sep 2000
The production of H(D) atoms was identified in the reactions of NO(A2Σ+) with C2H2, C2H4, H2O, and their isotopic variants. By measuring the Doppler profiles, the translational energies of H(D) atoms were determined. As for C2H2and H2O, around 1/4...
Toshiyuki Takayanagi, Yuzuru Kurosaki, Keiichi Yokoyama
International Journal of Quantum Chemistry   79 190-197   Aug 2000
The geometry of the transition state for the N(2D)+CH4 reaction has been reoptimized at the complete-active-space self-consistent field theory with a large active space and we have confirmed that the N(2D) atom initially inserts into a CH bond to ...
Hiromasa Tanaka, Keiichi Yokoyama, Hiroshi Kudo
Journal of Chemical Physics   113 1821-1830   Aug 2000
Stable structures and ionization energies of Lin(OH)n-1(n=2-5) were studied by density functional theory (DFT) and ab initio molecular orbital (MO) calculations. The stability of the isomers was examined by taking into account features of the sing...
Toshiyuki Takayanagi, Yuzuru Kurosaki, Keiichi Yokoyama
Chemical Physics Letters   321 106-112   Apr 2000
Potential energy surfaces for the N(4S,2D,2P)+H2reactions have been calculated using the ab initio multireference configuration interaction method. Two-dimensional surfaces were constructed for collinear and perpendicular approaches of N+H2in orde...
K. Yokoyama, N. Haketa, M. Hashimoto, K. Furukawa, H. Tanaka, H. Kudo
Chemical Physics Letters   320 645-650   Apr 2000
Lithium-excess binary clusters LinFn-1(n=2-9) were detected by photoionization time-of-flight mass spectrometry in a supersonic cluster beam generated by a laser ablation of a solid mixture of lithium fluoride and nitride. Laser power dependence o...
Atsushi Yokoyama, Toshiyuki Takayanagi, Keiichi Yokoyama
Proceedings of SPIE - The International Society for Optical Engineering   3886 223-230   Jan 2000
Dynamics of hydrogen chloride (HCl) elimination from halogenated hydrocarbon through three-center and four-center transition states has been elucidated by the measurement of translational, rotational, and vibrational energy distributions and ab in...
KUDO Hiroshi, HASHIMOTO Masashi, TANAKA Hiromasa, YOKOYAMA Keiichi
Mass spectroscopy   47(1) 2-9   Feb 1999
We present a combined experimental and theoretical study on the nature of hypervalent bonding in such molecules as Li2CN, Na2CN, K2CN, and Li2OH. The molecules M2CN (M=Li, Na, K) were observed...
Kazuo Takahashi, Yoshinobu Sekiuji, Yasuyuki Yamamori, Tadaaki Inomata, Keiichi Yokoyama
Journal of Physical Chemistry A   102 8339-8348   Oct 1998
The kinetics of the high-temperature reactions of CF3radicals with O(3P) and H atoms has been investigated experimentally and theoretically. The product channels of the CF3+ O(3P) and CF3+ H reactions were examined by calculating their branching f...
Hiroshi Kudo, Masashi Hashimoto, Keiichi Yokoyama, C. H. Wu, P. V.R. Schleyer
Thermochimica Acta   299 113-121   Sep 1997
The hypervalent M2CN (M = Li, Na, K) molecules have been detected in the vapor at elevated temperatures over mixtures of alkali metals and sodium cyanide by means of Knudsen-effusion mass spectrometry. The experimentally obtained ionization energi...
Atsushi Yokoyama, Keiichi Yokoyama, Toshiyuki Takayanagi
Journal of Physical Chemistry A   101 6647-6652   Sep 1997
The photodissociation dynamics of the title molecule at 157 nm has been studied using photofragment translational spectroscopy. The molecule was found to dissociate competitively via CHBrCF3+ Cl, CHClCF3+ Br, CHCF3+ Br + Cl, and CClCF3+ HBr channe...
Masashi Hashimoto, Keiichi Yokoyama, Hiroshi Kudo, C. H. Wu, Paul Ragué Von Schleyer
Journal of Physical Chemistry   100 15770-15773   Dec 1996
The Na2CN molecule has been detected in the vapor over a mixture of sodium metal and sodium cyanide by means of Knudsen effusion mass spectrometry. The ionization potential, IP(Na2CN+) = 4.9 ± 0.2 eV, and the energy of dissociation into NaCN and N...
Akira Ichihara, Toshizo Shirai, Keiichi Yokoyama
Journal of Chemical Physics   105 1857-1861   Aug 1996
Cross sections for ion production in the D++H2, D++D2, and H++D2collisions have been calculated in the center-of-mass collision energy range of 2.5 to 8.0 eV by using trajectory-surface-hopping method on ab initio potential energy surfaces. For th...
KUBO Hiroshi, YOKOYAMA Keiichi
Bull. Chem. Soc. Jpn.   69(6) 1459-1469   Jun 1996
This article describes the nature of bonding in hyperlithiated molecules with stoichiometries exceeding normal valence expectations. The existence of such hyperlithiated or hypervalent molecules as CLi6, Li3O, Li4O...
YUNOKI Kumi, TEZAKI Atsumu, YOKOYAMA Keiichi, MATSUI Hiroyuki
Bulletin of the Chemical Society of Japan   69(5) 1195-1199   May 1996
Kumi Yunoki, Atsumu Tezaki, Keiichi Yokoyama, Hiroyuki Matsui
Bulletin of the Chemical Society of Japan   69 1195-1199   Jan 1996
Gas-phase reactions of NH(a1Δ, v= 0,1)+H2(1) and NH(a1Δ, v=0,1)+D2(2) were studied in the photolysis of HNCO/H2(or D2) mixtures. NH(a1Δ) and product H (D) atom were detected by UV and vacuum-UV laser-induced fluorescence. The observed rate constan...
Hiroshi Kudo, Keiichi Yokoyama
Bulletin of the Chemical Society of Japan   69 1459-1469   Jan 1996
This article describes the nature of bonding in hyperlithiated molecules with stoichiometries exceeding normal valence expectations. The existence of such hyperlithiated or hypervalent molecules as CLi6, Li3O, Li4O, Li5O, Li3S, Li4S, Li4P, Li2CN, ...
Keiichi Yokoyama, Toshiyuki Takayanagi
Journal of Chemical Physics   104 1953-1957   Jan 1996
Title reaction has been investigated by a quantum mechanical reactive scattering method. A potential energy surface has been constructed on the basis of ab initio calculations at the MP2(fc)/6-311G(3df,3pd) level of theory. The reaction probabilit...
YOKOYAMA Atsushi, YOKOYAMA Keiichi, FUJISAWA Ginji
Bulletin of the Chemical Society of Japan   68(12) 3355-3363   Dec 1995
Katsuyoshi Yamasaki, Aki Tanaka, Akihiro Watanabe, Keiichi Yokoyama, Keiichi Yokoyama, Ikuo Tokue
Journal of Physical Chemistry   99 15086-15092   Dec 1995
Dibromodifluoromethane, CF2Br2, mixed with oxygen atoms was irradiated with an ArF (193 nm) laser. Difluoromethylene, CF2(X̃1A1, v1v2v3= 000 and v1v2v3= 010) was detected with laser-induced fluorescence via Ã1B1← X̃1A1020-000 and 030-010 transitio...
Atsushi Yokoyama, Keiichi Yokoyama, Ginji Fujisawa
Chemical Physics Letters   237 106-110   May 1995
Unimolecular dissociation dynamics of octafluorocyclobutane has been studied using photofragmentation translational spectroscopy. The product translational energy distribution for the reaction cyclo-C4F8→ 2 C2F4peaks at 31 kJ/mol with an average o...
Kei Sato, Shigeru Tsunashima, Toshiyuki Takayanagi, Keiichi Yokoyama, Ginji Fujisawa, Atsushi Yokoyama
Chemical Physics Letters   232 357-363   Jan 1995
The relative translational energy of distribution of HCl and C2HCl formed in the infrared multiphoton dissociation of 1,1-dichloroethene was measured by the time-of-flight method. The mean translational energy was evaluated to be 46 kJ mol-1. The ...
Keiichi Yokoyama, Ginji Fujisawa, Atsushi Yokoyama
The Journal of Chemical Physics   102 7902-7909   Jan 1995
The unimolecular dissociation of trichloroethylene in its electronic ground state has been investigated using an infrared multiphoton dissociation combined with photofragmentation translational spectroscopy to measure product translational energie...
Akira Ichihara, Keiichi Yokoyama
The Journal of Chemical Physics   103 2109-2112   Jan 1995
Three-dimensional potential energy surfaces of H3+in the two lowest1A′ electronic states have been calculated by the full configuration interaction method with a [8s6p2d1∫ Gaussian-type basis set. The features of the avoided crossing of two surfac...
Hiroshi Kudo, Hiroshi Kudo, Masashi Hashimoto, Keiichi Yokoyama, C. H. Wu, Andrea E. Dorigo, F. Matthias Bickelhaupt, Paul Von Ragué Schleyer
Journal of Physical Chemistry   99 6477-6482   Jan 1995
The Li2CN molecule has been detected by means of Knudsen effusion mass spectrometry. The ionization potential and the energy of dissociation to LiNC and Li, D0° (LiNC-Li), have been obtained. The measured value of D0° (LiNC-Li) is 32.7 ± 3.3 kcal/...
Atsushi Yokoyama, Keiichi Yokoyama, Ginji Fujisawa
The Journal of Chemical Physics   101 10602-10608   Jan 1994
Dynamics and mechanisms of infrared multiphoton dissociation of CBrF2CHClF, CBrF2CHBrF, and CBrClFCBrF2have been studied using a photofragmentation translational spectroscopy. All molecules dissociated through C-Br bond rupture reactions. At high ...
Atsushi Yokoyama, Keiichi Yokoyama, Ginji Fujisawa
The Journal of Chemical Physics   100 6487-6491   Jan 1994
Mechanism and dynamics of the infrared multiphoton dissociation of 2-chloro-1, 1,1,2-tetrafluoroethane have been studied using a photofragmentation translational spectroscopy. The molecule dissociates competitively through three-centered eliminati...
Hiroshi Kudo, Keiichi Yokoyama, C. H. Wu
The Journal of Chemical Physics   101 4190-4197   Jan 1994
The thermodynamical properties of the hyperlithiated molecules Li3S and Li4S were investigated by means of Knudsen effusion mass spectrometry and their stability and structure were studied through ab initio molecular orbital calculations. The Li3S...
Hironobu Umemoto, Shigeru Tsunashima, Hiroyuki Ikeda, Kazuto Takano, Kazuya Kuwahara, Kei Sato, Keiichi Yokoyama, Fuminori Misaizu, Kiyokazu Fuke
The Journal of Chemical Physics   101 4803-4808   Jan 1994
The reactions of Zn(41P1) with CH4, C2H6, C3H8, and C(CH3)4were studied by employing a laser pump-and-probe technique. The nascent rotational and vibrational state distributions of ZnH(X2Σ+) were determined. These distributions were compared with ...
Kentaro Tsuchiya, Keiichi Yokoyama, Hiroyuki Matsui, Masaaki Oya, Gabrielle Dupre
Journal of Physical Chemistry®   98 8419-8423   Jan 1994
The reaction of atomic oxygen (3P) with hydrogen sulfide was investigated by the shock tube/laser photolysis method at high temperatures (1100-2000 K), where the time dependence of O and H atoms was monitored with atomic resonance absorption spect...

Misc

 
横山 啓一, 松岡 雷士
Atomoσ : journal of the Atomic Energy Society of Japan = アトモス : 日本原子力学会誌   56(8) 525-528   Aug 2014
MIZUKI Jun'ichiro, AOKI Katsutoshi, KOIKE Masato, YOKOYAMA Keiichi
Ατομοσ   51(2) 88-93   Feb 2009

Conference Activities & Talks

 
Matsuoka Leo, Ichihara Akira, Yokoyama Keiichi
Proceedings of AESJ   2012   
時間依存シュレーディンガー方程式に基づく量子力学計算により、光周波数コムによるCsI分子の熱分布中での同位体選択的な励起挙動について評価した。計算の結果、光周波数コムによる同位体選択励起法が熱回転分布のある系においても高効率で適用可能であることを確認した。高温での熱分布を取り扱うための簡易な計算モデルと近似解析解についても議論する。
Matsuoka Leo, Yokoyama Keiichi
Meeting Abstracts of the Physical Society of Japan   2010   
Hosaka K., Itakura R., Yokoyama K., Yamanouchi K., Yokoyama A.
Meeting Abstracts of the Physical Society of Japan   2009   
Hosaka K., Itakura R., Yokoyama K., Yamanouchi K., Yokoyama A.
Meeting Abstracts of the Physical Society of Japan   2009   
Nakazawa Tetsuya, Yokoyama Keiichi, Viktors Grismanovs, Jitsukawa Shirou, Kaji Yoshiyuki
Proceedings of AESJ   2007   
リチウムシリケイト表面におけるH2分子の相互作用についてab initio 分子軌道計算を用いて調べた.表面水酸基や架橋酸素に吸着したH2分子の相互作用エネルギーは吸着サイトの近傍にLi原子が存在することで増加することがわかった.この結果からリチウムシリケイト表面に吸着したトリチウム(HT, T2)はその近傍にLi原子が存在することでより高温で放出されるものと考えられる.