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Single crystals of dl-valine were x-irradiated at liquid-nitrogen temperature. The ESR absorption spectrum was observed as the crystal warmed. After warming to 225°K, a definitive spectrum was obtained which is attributed to the formation of the free radical (CH3)2CHCHCOOH. A transformation of the absorption occurs at room temperature due to the formation of the free radical (CH3)2CCH(NH3+)COO−. This radical was examined by ESR and ENDOR spectroscopy.
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Box et al. (1967) studied this question.
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