STRIKING ENHANCEMENT AND RETARDING EFFECTS IN THE MULTI-QUASI-RESONANCE EVOLVEMENT IN ELECTRONIC A-]CIRCLE-TIMES-E JAHN-TELLER SPECTRA

Completely unexpected and drastic enhancement and retarding effects ar e predicted to occur in the multi-quasi-resonance evolvement pertinent to the electronic bandshape pertaining to the orbitally allowed inten sity of cold A --> E x e Jahn-Teller spectra in the strong linear regi me upon distorting the frequency of the e vibration during the radiati ve transition, while taking a fixed value for the strength of the line ar Jahn-Teller activity in the E x e system. These dramatic effects to gether with other strong accompanying changes resulting in the theoret ically calculated A <-> E x e spectra are in complete contradiction wi th the long-standing conjecture, originating in the classic paper of L onguet-Higgins et al., stating that the vibronic structure associated with the bandshape of these spectra will be virtually independent of s uch vibrational frequency distortions. (C) 1994 Academic Press, Inc.