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ENDOR spectroscopy has been employed to study the dynamics of the methyl groups in radicals obtained by irradiation of 2,2,5-trimethyl-1,3-dioxane-4,6-dione and Li-Lactate. The intensity of the ENDOR lines depends upon the temperature, because of methyl motion, and also upon the radio-frequency field strength, because of incomplete saturation of the nuclear transitions. From the analysis of the behaviour of the ENDOR enhancement it is possible to obtain the values of the parameters (barrier height and pre-exponential factor) of the Arrhenius relation for the methyl jumping rate.
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Brustolon et al. (1987) studied this question.
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