Abstract
External magnetic field effects upon photochemical reactions in solutions were classified into four cases by considering the singlet-triplet energy separation of a radical pair as a reaction intermediate and the singlet-triplet mixing through the electronic Zeeman and hyperfine coupling terms. Reaction systems corresponding to the respective cases have hitherto been found experimentally. The magnetic field effect was enhanced in micelles and was observed for the decay of the ketyl radicals of benzophenone, 4,4'-difluorobenzophenone, and others in sodium 1-dodecyl sulfate. The magnetic isotope effect was found for the decay of the benzophenone ketyl radical in micelles.
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