Abstract
Pulsed time-resolved fluorescence detected magnetic resonance (FDMR) was applied to examine spin dynamics in radical ion pairs. Two time-domain FDMR phenomena were examined; microwave-induced quantum beats and the formation of the ‘‘echo’’ signal. These experiments demonstrate the fast decay of the first-order coherence generated by a microwave field on the time scale of 0.05–1 μs. This decay originates through the phase relaxation in the triplet manifold of the pairs and is probably caused by electron dipole–dipole interaction of radical ions in spurs.
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