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Magnetic fields were found to decrease rhodamine-B---sensitized delayed fluorescence in anthracene by up to 60% at 10 mTorr. An inverse but smaller effect was found on sensitized photoconductivity. The observations are explained in terms of a magnetic-field-dependent recombination of surface electrons and injected holes, with the field scale being fixed by hyperfine interactions.
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Groff et al. (1972) studied this question.
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