A PCDMR (photoconductivity detected magnetic resonance) method developed recently is applied to the study of a photoinduced electron-transfer reaction. The PCDMR spectrum of the transient radical-ion pair formed by the photochemical reaction of xanthone/ N,N -diethylaniline in 2-propanol is observed for the first time. A peculiar PCDMR spectrum is observed by irradiation with strong microwaves. This spectrum is tentatively explained by spin−locking at the line center and by the transition at both broadened wing portions. The lifetime of the radical-ion pair is estimated to be 2 × 10 -7 s at room temperature and is anomalously long.
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Matsuyama et al. (1999) studied this question.
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