期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1974
卷号：71
期号：9
页码：3415-3417
DOI：10.1073/pnas.71.9.3415
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The purpose of this paper has been to develop a systematic approach for classifying and distinguishing the relative orders of approximation of various types of couplings like the vibronic (Herzberg-Teller) couplings and Born-Oppenheimer couplings, and for studying the importance of the anharmonicity in the quantitative calculation of the spectral intensity and electronic relaxation. It will be shown that the perturbation parameter introduced by Born and Oppenheimer in separating the electronic and nuclear motion involved in the molecular Schrodinger equation, {lambda} = (m/M)[1/4], can be used for this purpose by expanding wavefunctions and energies in power series of {lambda}.
关键词：adiabatic approximations ; Herzberg-Teller theory
