ISSN 0301-0104

Chemical Physics
Volume 143, N1, Pages 67-74
1 May 1990

The influence of the Coulomb and exchange interactions and of reactivity on recombination kinetics and CIDEP of geminate radical pairs

E. B. Krissinel'1, N. V. Shokhirev2

1Novosibirsk State University, Novosibirsk 630090, USSR
2Institute of Chemical Kinetics and Combustion, Siberian Branch of the USSR Academy of Sciences, Novosibirsk 630090, USSR

Received for publication August 8, 1989; Accepted December 14, 1989

 

Abstract

 

The recombination kinetics, the population of spin states and the electron polarization of geminate radical pairs have been analyzed numerically taking into account the exchange and the Coulomb interactions and the different reactivity of singlet and triplet states. Two mechanisms of spin dynamics dephasing that cause the damping of quantum beats in recombination kinetics due to long-range exchange interaction and the different recombination rates of singlet and triplet states have been analyzed and compared. The dependence of the form of beat kinetics on different parameters of a geminate radical pair has been studied. The influence of the Coulomb interaction strength and the singlet-triplet transition frequency has been shown to be opposite in the two mechanisms.