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A new method for the investigation of methyl group rotation dynamics in free radicals in solids is described, based on the temperature dependence of the methyl protons ENDOR enhancement. The method is shown to work for hindering barriers of any height, and for both radicals trapped in single crystals and in powdered samples. As specific examples, the Arrhenius parameters for the methyl rotation in free radicals produced by γ-irradiation of 1-alanine and 4-methyl-2, 6 di-t-butyl-phenol are determined.
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Brustolon et al. (1986) studied this question.
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