Detailed analysis of the mechanism of net electron spin polarization in liquid phase triplet-radical quenching

The kinetics of the generation of the net chemically induced dynamic electron polarization (CIDEP) in triplet-radical quenching (TRQ) in liquids is theoretically analyzed in detail. The method of treatment of non-adiabatic transitions between states of the TR spin hamiltonian which determine the TRQ is proposed. Analytical formulas are derived for the CIDEP-generation probability Pe and rate Ke, as well as for the TRQ probability Pq and rate Kq. It is shown that the dependence of Ke on the relative diffusion coefficient Dr is often non-monotonic, and this dependence cannot be correctly described by the usually applied relation Ke=KqPe.