THE INFLUENCE OF C-13 NUCLEI ON QUANTUM BEATS IN THE RECOMBINATION LUMINESCENCE OF RADICAL-ION PAIRS UNDERGOING ION-MOLECULAR CHARGE-TRANSFER

The presence of C-13 nuclei with high constants of hyperfine interacti on (hfi) can change essentially the quantum beat frequency in some sub ensembles of recombining radical ion pairs, The corresponding disturba nce of the total beat coherence due to the presence of C-13 nuclei is increased by ion-molecular charge transfer processes. The theoretical investigation of a model system, described in the present paper, shows that under some conditions the ion-molecular charge transfer can even lead to an increasing beat decay decrement with increasing concentrat ion of the reactant involved in the charge transfer. This is the case when due to the presence of C-13 nuclei with high hfi constants in one of the radical ions its hyperfine structure (hfs) is splitted into wi dely spaced spectral groups. Averaging of this two-range hfs during io n-molecular charge transfer can be the reason for the unusual concentr ation dependence of the decay decrement of recombination luminescence beats of radical ion pairs.