Theory of molecular deformation due to the vibronic interaction between two closely-spaced electronic levels. II. Green's function treatment.

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概要

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• Vibronic interaction between two closely-spaced electronic levels was investigated by use of the temperature Green's function. A Green's function version for the mean field approximation was derived which is capable of reproducing results obtained in the preceding work. The spectrum of phonon in the normal phase was then calculated and the critical (strictly speaking, characteristic, since we are dealing with a finite system) temperature <I>T</I><SUB>c</SUB> was obtained where the phonon becomes completely soft causing lattice distortion. The fluctuation effect was investigated and the mean field theory was examined for its applicability. When the level spacing is comparable to or larger than the value of the electron-phonon coupling constant, the mean field theory is satisfactory, but when the two levels are nearly degenerate, it is not so good because the problem in question is in the regime involving extremely strong coupling.

• 公益社団法人 日本化学会の論文

著者

• Kimura Minoru

  Department Of Dna Biology School Of Medicine Tokai University

• Aono Shigeyuki

  Department Of Chemistry College Of Arts And Sciences Chiba University

• Nishikawa Kiyoshi

  Department Of Chemistry Faculty Of Science Kanazawa University

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