Abstract

The dynamic effect of a polar (nonreactive) solvent on the rate of electronic relaxation (ER) in polyatomic molecules is analyzed on the basis of the concept of thermal fluctuations of the energy levels involved in the transition initiated by the slow processes of reorientation of the solvent dipoles. The solvent participation in the transition is described by a single collective coordinate with defined relaxation properties. From these properties, an expression for the rate of ER which includes solvent parameters (the reorganization energy and the solvent-induced energy gap) is derived within the harmonic model for the intramolecular oscillators

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