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The reduction product produced by ionizing radiation in single crystals of adenine dihydrochloride x irradiated at 4.2 °K was studied by ESR–ENDOR spectroscopy. Addition of an electron to the protonated base yields a free radical with a spin density of approximately 0.30 on the C-8 carbon atom. The spin density was inferred from ENDOR measurements of the hyperfine coupling of the C8–H proton.
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Box et al. (1976) studied this question.
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