Abstract
The effects of the geminate recombination induced by the pulsed microwave irradiation on the electron paramagnetic resonance spectra of radicals generated in the photoinitiated hydrogen abstraction reaction of 2-methyl-1,4-naphthoquinone in a micellar sodium dodecylsulphate solution have been studied using an inversion recovery method of pulsed electron paramagnetic resonance. It was found that the stimulated nuclear polarization resulting from the microwave-induced recombination of the geminate radical pairs at one (or a limited group) of nuclear spin configurations affects the polarization and intensity of the electron paramagnetic resonance spectra of escaped radicals via the electron-nuclear cross-relaxation mechanism. The long lifetimes of the radical pairs in a micellar system facilitate the observation of the effects. Similar effects, though of much smaller scale, were found to be detectable in certain conditions also in homogeneous solutions.
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