PHOTOSEPARATION OF ION RADICALS FOLLOWING EXCIPLEX FORMATION AND SPINCONVERSION

Assuming that exciplexes are formed from solvent-separated ion pairs t hat are subjected to singlet-triplet conversion, we calculated the exc iplex fluorescence and ion-radical separation quantum yields. Analytic al expressions for both were obtained within the contact approximation for ion recombination to the excited triplet state. The spin conversi on affects the competition between exciplex formation and charge recom bination if their rates are not equal. The effect significantly depend s on the initial separation of photochemically generated ion pairs and the rate of spin conversion that can be changed with the external mag netic field.