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Abstract
The time dependent E.S.R. spectra of the duroquinone anion radical, DQ-, produced by laser flash photolysis, are studied in detail and shown to be quantitatively consistent with previous theoretical predictions. It is established that the degenerate electron transfer reaction between DQ- and its parent molecule is an important spin relaxation mechanism in this radical and that it has a profound effect on the form of the experimental E.S.R. time profiles.