SPIN COHERENCE EFFECTS OBSERVED IN THE OD ESR-SPECTRA OF RADICAL PAIRS WITH STRONG HYPERFINE INTERACTION

The optically detected ESR technique is used to record the spectra of a radical pair generated in the photolysis of 2,4,6-trimethylbenzoyl d iphenylphosphine oxide in a micellar sodium dodecylsulfate solution. A long with the signals of the radicals of the pair, additional resonanc es have been detected in the spectrum, whose signal is inverted with r espect to the fundamental ones. It is shown that the inverted lines co nsist of narrow and wide components, which arise from the effects of c rossing and anticrossing of pair spin energy levels, respectively. (C) 1998 Elsevier Science B.V.