論文

• Yoichi Murakami, Toshiyuki Ito, Akio Kawai. Ionic Liquid Dependence of Triplet-Sensitized Photon Upconversion, Journal of Physical Chemistry B, American Chemical Society, vol. 118, pp. 14442, Nov. 2014.  公式リンク  
  
• Y. Murakami, H. Kikuchi, A. Kawai. Kinetics of Photon Upconversion in Ionic Liquids: Time-Resolved Analysis of Delayed Fluorescence, Journal of Physical Chemistry B, American Chemical Society, vol. 117, pp. 5180, Mar. 2013.  公式リンク  
  
• Y. Murakami, H. Kikuchi, A. Kawai. Kinetics of Photon Upconversion in Ionic Liquids: Energy Transfer between Sensitizer and Emitter Molecules, Journal of Physical Chemistry B, American Chemical Society, vol. 117, pp. 2487, Feb. 2013.  公式リンク  
  
• Nobuyuki Akai, Akio Kawai, KAZUHIKO SHIBUYA. Ion-pair structure of vaporized ionic liquid studied by matrix-isolation FTIR spectroscopy with DFT calculation: A case of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, Vol. 114, p. 12662-12666, Dec. 2010.
• Nobuyuki Akai, Daisuke Wakamatsu, Akio Kawai, KAZUHIKO SHIBUYA. Matrix-isolation infrared spectra of HOOBr and HOBrO produced upon VUV light irradiation of HBr/O2/Ne system, Chemical physics letters, Vol. 499, p. 117-120, Oct. 2010.
• T.Yoshinobu, N.Akai, A.Kawai, K.Shibuya. Neon matrix-isolation infrared spectrum of measured upon VUV-light irradiation of an HCl/O₂ mixture, Chemical Physics Letters, elsevier, Vol. 477, p. 70-74, July 2009.
• Eiji Furui, Nobuyuki Akai, Akira Ida, Akio Kawai, KAZUHIKO SHIBUYA. Observation of collision-induced near-IR emission of singlet oxygen O₂ a¹∆_g generated by visible light excitation of gaseous O₂ dimol, Chemical Physics Letters, elsevier, Vol. 471, p. 45-49, Mar. 2009.
• Nobuyuki Akai, David Parazs, Akio Kawai, KAZUHIKO SHIBUYA. Cryogenic Neon Matrix-Isolation FTIR Spectroscopy of Evaporated Ionic Liquids: Geometrical Structure of Cation-Anion 1:1 Pair in the Gas Phase, Journal of Physical Chemistry B, ACS, Vol. 113, p. 4756-4762, Feb. 2009.
• Yusuke Miyake, Takehiro Hidemori, Nobuyuki Akai, Akio Kawai, KAZUHIKO SHIBUYA, Shinichi Koguchi, TOMOYA KITAZUME. EPR Study of Rotational Diffusion in Viscous Ionic Liquids: Analysis by a Fractional Stokes–Einstein–Debye Law, Chemistry letters, 日本化学会, Vol. 38, p. 124-125, Feb. 2009.
• Nobuyuki Akai, Akio Kawai, KAZUHIKO SHIBUYA. First Observation of the Matrix-isolated FTIR Spectrum of Vaporized Ionic Liquid: An Example of EmimTFSI, 1-Ethyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide, Chemistry Letters, 日本化学会, Vol. 37, No. 3, Page 256, Feb. 2008.
• Akio Kawai, Kazuhiko Shibuya. Charge transfer controlled exchange interaction in radical-triplet encounter pairs as studied by FT-EPR spectroscopy, Journal of Physical Chemistry A, Vol. 111, p. 4890-4901, 2007.
• Masashi Tsuge, Kazuhide Tsuji, Akio Kawai, Kazuhiko Shibuya. Infrared spectroscopy of ozone-water complex in a neon matrix, Journal of Physical Chemistry A, American Cehmical Society, Vol. 111, p. 3540-3547, 2007.
• Masashi Tsuge, Satoshi Hamatani, Akio Kawai, Kazuhide Tsuji, Kazuhiko Shibuya. Jet Spectroscopy of Arylmethyl Radicals in the Visible Region: Assignment of Low-Frequency Vibrational Modes in Diphenylmethyl and Chlorodiphenylmethyl Radicals, Phys.Chem.Chem.Phys., Vol. 8, pp. 256-263, 2006.
• Hajime Terazono, Akio Kawai, Kazuhide Tsuji, Kazuhiko Shibuya. Enhanced intersystem crossings of S1-T1 and T1-S0 in coronene- and pyrene-galvinoxyl systems as studied by a pulsed ESR method, J.Photochem.Photobio. A :Chemistry, Vol. 183, pp. 22-30, 2006.
• Mayaka Ando, Shigeru Yoshiike, Tadashi Suzuki, Teijiro Ichimura, Tetsuo Okutsu, Minoru Ueda, Hiroaki Horiuchi, Hiroshi Hiratsuka, Akio Kawai, Kazuhiko Shibuya. Evidence of phenoxymethyl radical formation in laser photolyses of anisole in solution, J.Photochem.Photobio. A :Chemistry, Vol. 174, pp. 194-198, 2005.
• Akio Kawai, Takehiro Hidemori, Kazuhiko Shibuya. Solvation of a-hydroxydiphenylmethyl radical in room temperature ionic liquids studied by transient FT-EPR spectroscopy, Chemical Physics Letters, Vol. 414, pp. 378-383, 2005.
• Akio Kawai, Takehiro Hidemori, Kazuhiko Shibuya. Electron Spin Dynamics of Triplet and Doublet Molecules in Room Temperature Ionic Liquids Studied by A Time-resolved EPR Method, Molecular Physics, Vol. in press, 2005.
• Masaaki Mitsui, Yasuhiro Kobori, Keizo Takeda, Akio Kawai, Kinichi Obi. Unusually large dynamic electron polarization in an O2(1Dg)-2,2,6,6-tetramethylpiperidine-1-oxyl radical system, J.Phys.Chem.A, Vol. 108, pp. 1120, 2004.
• Akio Kawai, Takehiro Hidemori, Kazuhiko Shibuya. Polarity of Room Temperature Ionic Liquid as Examined by EPR Spectroscopy, Chemistry Letters, Vol. 33, No. 11, pp. 1464, 2004.
• Masaaki Mitsui, Yasuhiro Kobori, Akio Kawai, Kinichi Obi. Quenching mechanism of excited coronene by a nitroxide radical studied by probing dynamic electron polarization, J.Phys.Chem.A, Vol. 108, pp. 524, 2004.
• Akio Kawai. FT-EPR study on the sign of exchange interaction in triplet naphthalene-galvinoxyl encounter pair, Applied Magnetic Resonance, Vol. 26, pp. 213, 2004.
• Akio Kawai, Yasuyuki Watanabe, Kazuhiko Shibuya. Control of ferromagnetic and antiferromagnetic couplings in a galvinoxyl-triplet chrysene encounter complex through solvent polarity, Chem.Phys.Letters, Vol. 372, pp. 8, 2003.
• Akio Kawai, Hironao Tanaka, Yoshiki Nakashima, Toshifumi Iimori, Kazuhide Tsuji, Kinichi Obi, Kazuhiko Shibuya. Protonation and multi-hydrogenation of benzophenone (BP) in BP/toluene and BP/ethanol binary cation clusters, Chem.Phys.Letters, Vol. 381, pp. 354, 2003.
• Akio Kawai. Dynamic Electron Polarization Created by the Radical-Triplet Pair Mechanism: Application to the Studies on Excited State Deactivation Processes by Free Radicals, Appled Magnetic Resonance, Vol. 23, pp. 349, 2003.
• Kazuhide Tsuji, Masashi Ikeda, Jun-ichi Awamura, Akio Kawai, Kazuhiko Shibuya. Vibrational level dependence of lifetime of NO2 in the D2B2 state, Chem.Phys.Letters, Vol. 374, pp. 601, 2003.
• Satoshi Hamatani, Kazuhide Tsuji, Akio Kawai, Kazuhiko Shibuya. Dispersed Fluorescence Spectra of Jet-Cooled Benzophenone Ketyl Radical: Assignment of the Low-Frequency Vibrational Modes, Phys.Chem.Chem.Phys., Vol. 5, pp. 1370, 2003.
• Akio Kawai, Yasuyuki Watanabe, Kazuhiko Shibuya. Time resolved ESR study on energy difference of quartet and doublet states in radical-triplet encounter pairs, Molecular Physics, Vol. 100, pp. 1225-1234, 2002.
• Satoshi Hamatani, Kazuhide Tsuji, Akio Kawai, Kazuhiko Shibuya. Laser Induced Fluorescence, Dispersed Fluorescence, and Lifetime Measurements of Jet-Cooled Chloro-Substituted Benzyl Radicals, Chemical Physics Letters, Vol. 360, pp. 466, 2002.
• Akio Kawai, Shogo Noguchi, Kinichi Obi. Competition between exciplex formation and hydrogen abstraction reaction in benzophenone/1,4-cyclohexadiene binary clusters, Chemical Physics Letters, Vol. 362, pp. 397, 2002.
• Masakazu Nakajima, Akio Kawai, Masaru Fukushima, Kinichi Obi. LIF spectroscopy and dissociation dynamics of the S_iH₂ radical in the A1B1(1,v2,0) state, Chemical Physics Letters, Vol. 364, pp. 99, 2002.
• Akio Kawai, Kazuhiko Shibuya. Energy separation between quartet and doublet spin states of radical-triplet encounter pairs; unusual ferromagnetic interaction in a 1,1-diphenyl-2-picrylhydrazyl and triplet coronene pair, J.Phys.Chem.A, Vol. 106, pp. 12305, 2002.
• Akio Kawai, Takahito Fuse, Kazuhiko Shibuya. Quenching of singlet molecular oxygen (¹D_g) by vitamins and polyphenols studied by time-resolved ESR, EPR in the 21st century, pp. 249-354, 2002.
• Kazuhide Tsuji, Naoko Arakawa, Akio Kawai, Kazuhiko Shibuya. Spectroscopy and predissociation of acetylene in the np gerade Rydberg states, The Journal of Physical Chemistry A, Vol. 106, pp. 747-753, 2002.
• Tetsuo Okutsu, Masaki Ooyama, Katsuhiko Tani, Hiroshi Hiratsuka, Akio Kawai, Kinichi Obi. A Kinetic Study on the Spin Polarization Switching of Benzil in the Presence of Triethylamine, The Journal of Physical Chemistry A, Vol. 105, pp. 3741, 2001.
• Akio Kawai, Atsushi Shikama, Masaaki Mitsui, Kinichi Obi. Time Resolved ESR Study on the Photochemical Reactions of Pyrene and Nitroxide Radical System in Micelle; Formation of Spin Correlated Pyrene Cation-Nitroxide Pairs, Bulletin of the Chemical Society of Japan, Vol. 74, pp. 1203, 2001.
• Akio Kawai, Makoto Hirakawa, Toyohiko Abe, Kinichi Obi, Kazuhiko Shibuya. Specific Solvent Effects on the Structure and Reaction Dynamics of Benzophenone Ketyl Radical, The Journal of Physical Chemistry A, Vol. 105, No. 42, pp. 9628, 2001.
• Akio Kawai, Ryuji Kohno, Nobuhiro Oki, Kinichi Obi. Exciplex formation reaction in benzaldehyde-1,4-dimethoxybenzene clusters, Chemical Physics Letters, Vol. 318, pp. 85, 2000.
• T.Okutsu, S.Noda, S.Tanaka, A.Kawai, K.Obi, H.Hiratsuka. Nature of excited singlet and non-phosphorescent triplet states of perinaphthenone, Journal of Photochemistry and Photobiology, A:Chemistry, Vol. 132, pp. 37, 2000.
• A.Kawai, K.Shibuya, K.Obi. Effect of Charge Transfer State on the Exchange Interaction of Radical-Triplet Encounter Pairs, Applied Magnetic Resonace, Vol. 18, pp. 343, 2000.
• Akio Kawai, Tetsuya Yamamoto, Tetsuo Okutsu, Kinichi Obi. Chemically Induced Dynamic Electron Polarization in the Photoreduction of Aromatic Ketones with ππ*-Type Triplet Molecules, Bulletin of the Chemical Society of Japan, Vol. 72, No. 12, pp. 2625, 1999.
• Toshifumi Iimori, Masanao Tanaka, Akio Kawai, Kinichi Obi. Time-of-flight mass spectroscopy of benzophenone-benzene and benzophenone-1,4-cyclohexadiene clusters using one-color multiphoton ionization method, Chemical Physics Letters, Vol. 309, pp. 351-356, 1999.
• Toyohiko Abe, Akio Kawai, Yoshizumi Kajii, Kazuhiko Shibuya, kinichi Obi. Solvent Effects on the Complex Formation of Benzophenone Ketyl Radical and Triethylamine, Journal of Physical Chemistry A, Vol. 103, pp. 1457-1462, 1999.
• Yasuhiro Kobori, Keizo Takeda, Kazuhide Tsuji, Akio Kawai, Kinichi Obi. Exchange Interaction in Radical-Triplet Pairs: Evidences for CIDEP Generation by Level Crossings in Triplet-Doublet Interactions, Journal of Physical Chemistry A, Vol. 102, pp. 5160-5170, 1998.
• N.K.Shurestha, E.J.Yagi, Y.Takatori, A.Kawai, Y, Kajii, K, Shibuya, K.Obi. Photochemical a-cleavage reaction of benzoin and its derivatives, Journal of Photochemistry and Photobiology, A:Chemistry, Vol. 116, pp. 179-185, 1998.
• J.C.Crain, A.Kawai, H.Nam, H.Crauberg, H.Beal, P.Guinn, C.B.Moore. Vibrational Assignment and Anharmonic Resonance Analysis of the Dispersed Fluorescence and Stimulated Emission Pumping Spectra of DFCO (S₀) up to 9000 cm^-1, Journal of Molecular Spectroscopy, Vol. 183, pp. 273-284, 1997.
• Akio Kawai, Masaaki Mitsui, Yasuhiro Kobori, Kinichi Obi. CIDEP in Singlet Molecular Oxygen-Radical System, Applied Magnetic Resonance, Vol. 12, pp. 405-410, 1997.
• Y.Kobori, M.Mitsui, A.Kawai, K.Obi. Absolute Magnitude of Spin Polarization in Radical-Triplet Pair Mechanism: CIDEP Generation by Level Crossings in Triplet-Doublet Interaction, Chemical Physics Letters, Vol. 252, pp. 355-361, 1996.
• A.Kawai, A.Aoki, Y, Kobori, K.Obi. Time-Resolved ESR Studies on Ketyl Type Radical-Amine Complexes, Journal of Physical Chemistry, Vol. 100, pp. 10021-10026, 1996.
• M.Mitsui, K.Takeda, Y.Kobori, A.Kawai, K.Obi. The first observation of CIDEP in radical-singlet molecular oxygen, Chemical Physics Letters, Vol. 262, pp. 125-130, 1996.
• Akio Kawai, Shogo Noguchi, Kinichi Obi. Hydrogen atom transfer reaction of benzophenone in the neutral clusters, Structures and Dynamics of Clusters (Universal Academy Press INC), pp. 363, 1995.
• A.Kawai, T.Okutsu, K.Obi. Anisotropic S₁-T₁ Intersystem Crossing of 1-Chloromethylnaphthalene, Chemical Physic Letters, Vol. 235, pp. 450-455, 1995.
• Y.Kobori, A.Kawai, K.Obi. Direct Observation of CIDEP Generated through Enhanced Intersystem Crossing, Journal of Physical Chemistry, Vol. 98, pp. 6425-6429, 1994.
• A.Kawai, Y.Kobori, K.Obi. Time-resolved ESR spectra of the a-hydroxybenzyl-amine complex, Chemical Physics Letters, Vol. 215, pp. 203-208, 1993.
• A.Kawai, T.Okutsu, K.Obi. CIDEP in the photosensitized dissociation of benzylchloride, Chemical Physics Letters, Vol. 198, pp. 637-640, 1992.
• A.Kawai, K.Obi. First Observation of a Radical-Triplet Pair Mechanism with Doublet Precursor, Journal of Physical Chemistry, Vol. 96, pp. 52-56, 1992.
• A.Kawai, K.Obi. Viscosity Dependence of Chemically Induced Dynamic Electron Spin Polarization Generated by the Radical-Triplet Pair Mechansim, Journal of Physical Chemistry, Vol. 96, pp. 5701-5704, 1992.
• Kinichi Obi, Akio Kawai. Electron Spin Polarization Generated in Singlet-Doublet and Triplet-Doublet Systems, Oji International Conference on Spin Chemistry, pp. 105, 1991.
• T.Okutsu, K.Yano, A.Kawai, K.Obi. Dual Spin Polarization of CIDEP in Benzil/Quencher System, Journal of Physical Chemistry, Vol. 95, pp. 5401-5405, 1991.
• A.Kawai, T.Okutsu, K.Obi. Spin Polarization Generated in the Triplet-Doublet Interaction: Hyperfine Dependent Chemically Induced Dynamic Electron Polarization, Journal of Physical Chemistry, Vol. 95, pp. 9130-9134, 1991.
• A.Kawai, T.Okutsu, K.Obi. CIDEP in the photodissociation of 1-chloromethylnaphthalene, Chemical Physics Letters, Vol. 174, pp. 213-218, 1990.
• T.Okutsu, A.Kawai, K.Obi. Direct Observation of the Triplet-Triplet Energy Transfer to the Second Excited Triplet State, Journal of Physical Chemistry, Vol. 93, pp. 7757-7759, 1989.

著書

• 河合明雄. 化学便覧　基礎編　改訂5版, 丸善, pp. 12-5-2, 2003.

その他の論文・著書など

• Akio Kawai, Kazuhiko Shibuya. Electron spin dynamics in a pair interaction between radical and electronically-excited molecule as studied by a time-resolved ESR method, J.Photochem.Photobiol.C, Photochemistry reviews, Vol. 7, pp. 89-103, 2006.
• 河合明雄. 時間分解ESR法による一重項酸素 (1g) の寿命測定, 分光研究, Vol. 55, pp. 199-201, 2006.
• 河合明雄. スピン分極で観るラジカル衝突ダイナミクス, 電子スピンサイエンス学会, Vol. 3, pp. 19-24, 2005.
• Hisao Murai, Seigo Yamauchi, Akio Kawai, Kinichi Obi, Noboru Hirota. Developments of Magnetic Resonance Related Spin Chemistry in Japan, Applied Magnetic Resonance, Vol. 23, pp. 249, 2003.
• 河合明雄. 電子スピン分極プローブ法による凝縮相での励起消光過程の研究, 分光研究, Vol. 50, No. 4, pp. 1, 2001.
• 河合明雄. 常磁性分子の質量選別を目的とした六極磁場フィルターの試作, 分光研究, Vol. 49, pp. 193-195, 2000.
• A.Kawai, K.Obi. A New Mechanism of Electron Spin Polarization Generated through Radical-Excited Molecule Interactions, Research on Chemical Intermediate, Vol. 19, pp. 865-894, 1993.

学位論文

• A New Mechanism on the Generation of Electron Spin Polarization through Interactions between Radical and Excited Molecule,  Thesis,  Doctor of Science,  東京工業大学理工学研究科化学専攻,  1992/03/26,    (学位授与組織:東京工業大学理工学研究科化学専攻)

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