THEORY OF GEMINATE RECOMBINATION OF RADICAL PAIRS WITH INSTANTANEOUSLY CHANGING SPIN-HAMILTONIAN .1. GENERAL-THEORY AND KINEMATIC APPROXIMATION

A general theory of geminate recombination of radical pairs with instantaneously changing spin-Hamiltonian has been constructed on the basis of the formalism of Green functions which characterize the molecular motion of reagents. The kinematic approximation has allowed us to reduce the calculation of the values determining the spin state of the products to matrix operations. The operator matrices, involved in the resulting expressions, are determined by the "convolution" of spin dynamics with a function describing molecular motion. The form of such a function has been established for a well-known phenomenological two-positional model of radical pair.