Effect of the Medium and Intramolecular Oscillations on the Kinetics of a Population of Triplet State Donor Molecules

A stochastic approach is used to numerically study kinetics of the population of the triplet state of an electron donor molecule caused by photoinduced electron transfer from a donor to a paramagnetic acceptor and back. Conditions are determined and a general strategy is formulated for achieving maximum efficiency of the electron transfer-induced accumulation of triplet molecules. It is shown that solvents with fast dielectric relaxation contribute to an increase in the efficiency of the considered process.