A CONTRIBUTION TO THE THEORY OF OD EPR OF SPIN-CORRELATED RADICAL PAIRS

A composite structure of OD EPR spectra is predicted. The OD EPR spect ra consist of a broad component which manifests many features similar to conventional CW EPR spectra and a narrow component which appears as a hole in the broad spectrum. The width of the narrow component is es timated. The contribution of singlet-tripler dephasing to the shape of the OD EPR spectra is discussed comprehensively. It is shown that cha nges of the OD EPR spectra with an increase in the rate of singlet-tri pler dephasing can be interpreted in terms of a redistribution of the populations of mixed (singlet and tripler) states of radical pairs and of exchange of the coherences corresponding to the EPR transitions fo r radical pairs. (C) 1997 Published by Elsevier Science B.V.