THE EFFECT OF MAGNETIC AND SPIN INTERACTIONS ON OUTER-SPHERE ELECTRON-TRANSFER

A simple dynamical model of electron transfer in a donor-acceptor pair in the presence of a paramagnetic center placed in the vicinity of th e acceptor is considered. A detailed numerical study of the influence of an external magnetic field and the exchange interaction between the transferred electron and the paramagnetic center on the electron tran sfer rate and coherent spin states formation is carried out. It is fou nd that if the exchange interaction is sufficiently strong then the ma gnetic field effect can be observed only in the transition region betw een the adiabatic and nonadiabatic limits. If the exchange interaction is weak, then the effect is considerable in the whole adiabatic regio n and it exhibits a multiple-resonance-like dependence on both the mag netic field strength and the exchange integral. The physical mechanism of the magnetic field and exchange interaction influence on the dynam ics of the electron transfer elementary act are discussed in detail.