Proceedings PaperLaser investigation of molecular dynamic processes of the relaxational spectra formation
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in the so-called "configurational" vibronic spectra of complex polyatomic molecules in vapors and solutions,' the contours and widths L\v, being ruled by the Frank-Condon factors set, are practically independent on the solvent which only changes the frequency. These spectra obey the mirror symmetry rule (see Fig.1, upper-left part). The spectra of the other type, discovered later and named in Ref. 2 as "relaxational spectra", differ sharply from the usual "configurational" ones (see Fig. 1, upper-right part). Their widths v are proportional to the squared frequency of the band maximum Vm: Ev = Kv,, K roughly conserving its value constant for all the spectra of a given molecule both in vapors and solutions. The bandwidth changes in solution spectra are evidently due to a solvent induced dielectric shift of the frequency.