Non-adiabatic transitions in the condensed phase Derivation of multichannel Fokker–Planck equations from quantum relaxation theory

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Michael V. Basilevsky and Anatoli I. Voronin


Abstract

A new formalism is proposed for the derivation of multichannel Fokker–Planck equations describing reactive processes in the condensed phase. It is based upon the method of quantum-classical reduction for the dynamical and relaxation parts of the general equation of quantum relaxation theory. In this way, the multilevel non-Markov Fokker–Planck and Smoluchovsky-type equations are obtained taking into account the non-adiabatic dynamics of the system. These equations include memory effects with a generalization of the non-local relaxation kernel beyond the high-temperature approximation. The formulation of the balance equations describing the kinetics of non-adiabatic reactions in polar solvents is examined and the prospects of deriving corresponding rate expressions are discussed.


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