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Kenichi Koizumi
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A general algorithm for calculation of Heisenberg exchange integrals J in multispin systems
M Shoji, K Koizumi, Y Kitagawa, T Kawakami, S Yamanaka, M Okumura, ...
Chemical physics letters 432 (1-3), 343-347, 2006
3242006
Approximately spin-projected geometry optimization method and its application to di-chromium systems
Y Kitagawa, T Saito, M Ito, M Shoji, K Koizumi, S Yamanaka, T Kawakami, ...
Chemical physics letters 442 (4-6), 445-450, 2007
1392007
Electronic and spin structures of manganese clusters in the photosynthesis II system
H Isobe, M Shoji, K Koizumi, Y Kitagawa, S Yamanaka, S Kuramitsu, ...
Polyhedron 24 (16-17), 2767-2777, 2005
612005
Theory of chemical bonds in metalloenzymes VI: Manganese–oxo bonds in the photosynthesis II system
K Yamaguchi, S Yamanaka, H Isobe, M Shoji, K Koizumi, Y Kitagawa, ...
Polyhedron 26 (9-11), 2216-2224, 2007
532007
Theory of chemical bonds in metalloenzymes I: Analytical and hybrid‐DFT studies on oxo and hydroxo diiron cores
M Shoji, Y Nishiyama, Y Maruno, K Koizumi, Y Kitagawa, S Yamanaka, ...
International journal of quantum chemistry 100 (6), 887-906, 2004
502004
Hydrogen storage mechanism and diffusion in metal–organic frameworks
K Koizumi, K Nobusada, M Boero
Physical Chemistry Chemical Physics 21 (15), 7756-7764, 2019
482019
The electronic structure and magnetic property of metal‐oxo, porphyrin manganese‐oxo, and μ‐oxo‐bridged manganese porphyrin dimer
K Koizumi, M Shoji, Y Nishiyama, Y Maruno, Y Kitagawa, K Soda, ...
International journal of quantum chemistry 100 (6), 943-956, 2004
472004
Theory of chemical bonds in metalloenzymes III: Full geometry optimization and vibration analysis of ferredoxin‐type [2Fe–2S] cluster
M Shoji, K Koizumi, T Taniguchi, Y Kitagawa, S Yamanaka, M Okumura, ...
International Journal of Quantum Chemistry 107 (1), 116-133, 2007
412007
Theory of chemical bonds in metalloenzymes IV: Hybrid‐DFT study of Rieske‐type [2Fe 2S] clusters
M Shoji, K Koizumi, Y Kitagawa, S Yamanaka, M Okumura, K Yamaguchi
International Journal of Quantum Chemistry 107 (3), 609-627, 2007
412007
Theory of chemical bonds in metalloenzymes. XV. Local singlet and triplet diradical mechanisms for radical coupling reactions in the oxygen evolution complex
K Yamaguchi, M Shoji, T Saito, H Isobe, S Nishihara, K Koizumi, ...
International Journal of Quantum Chemistry 110 (15), 3101-3128, 2010
392010
A theoretical study of zero-field splitting of organic biradicals
M Shoji, K Koizumi, T Hamamoto, T Taniguchi, R Takeda, Y Kitagawa, ...
Polyhedron 24 (16-17), 2708-2715, 2005
392005
Atom-scale reaction pathways and free-energy landscapes in oxygen plasma etching of graphene
K Koizumi, M Boero, Y Shigeta, A Oshiyama
The Journal of Physical Chemistry Letters 4 (10), 1592-1596, 2013
332013
Theory of chemical bonds in metalloenzymes V: Hybrid‐DFT studies of the inorganic [8Fe–7S] core
M Shoji, K Koizumi, Y Kitagawa, S Yamanaka, M Okumura, K Yamaguchi, ...
International journal of quantum chemistry 106 (15), 3288-3302, 2006
332006
High turnover frequency CO–NO reactions over Rh overlayer catalysts: a comparative study using Rh nanoparticles
H Yoshida, K Koizumi, M Boero, M Ehara, S Misumi, A Matsumoto, ...
The Journal of Physical Chemistry C 123 (10), 6080-6089, 2019
292019
Geometry optimization method based on approximate spin projection and its application to F2, CH2, CH2OO, and active site of urease
Y Kitagawa, T Saito, M Ito, Y Nakanishi, M Shoji, K Koizumi, S Yamanaka, ...
International Journal of Quantum Chemistry 107 (15), 3094-3102, 2007
292007
Theory of chemical bonds in metalloenzymes II: Hybrid‐DFT studies in iron–sulfur clusters
M Shoji, K Koizumi, Y Kitagawa, S Yamanaka, T Kawakami, M Okumura, ...
International journal of quantum chemistry 105 (6), 628-644, 2005
292005
Theory of chemical bonds in metalloenzymes. VII. Hybrid‐density functional theory studies on the electronic structures of P450
M Shoji, H Isobe, T Saito, H Yabushita, K Koizumi, Y Kitagawa, ...
International Journal of Quantum Chemistry 108 (4), 631-650, 2008
262008
Theoretical studies on effects of hydrogen bonds attaching to cysteine ligands on 4Fe‐4S clusters
Y Kitagawa, M Shoji, T Saito, Y Nakanishi, K Koizumi, T Kawakami, ...
International Journal of Quantum Chemistry 108 (15), 2881-2887, 2008
222008
How seaweeds release the excess energy from sunlight to surrounding sea water
K Koizumi, M Hatakeyama, M Boero, K Nobusada, H Hori, T Misonou, ...
Physical Chemistry Chemical Physics 19 (24), 15745-15753, 2017
192017
Theoretical studies on ferrimagnetic behavior of TCNE and manganese porphyrin dimer
K Koizumi, M Shoji, Y Kitagawa, T Taniguchi, T Kawakami, M Okumura, ...
Polyhedron 24 (16-17), 2720-2725, 2005
192005
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