Consideration of Electronic-Vibrational Interactions in Calculations of Electronic Transition Moments for Diatomic Molecules

Two different approaches to the determination of the dependence of the electronic transition moment on the internuclear distance, M_e(R), are considered. It is shown that M_e(R) dependences obtained by ab initio and semi-empirical methods take into account electronic-vibrational interactions in a various manner. In semi-empiral methods these interactions are take into account to a greater degree, than in non-empirical quantum-mechanical methods which do not include nonadiabatic corrections. A system of concepts, which allows to unite the information obtained in two different, mutually complementing ways, is considered in the paper.