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- W2086815199 abstract "Trapped radicals, formed by ultraviolet irradiation of pure, unsaturated aliphatic hydrocarbons, maintained at 77°K, have been observed with a 3-cm electron spin resonance spectrometer at a g factor of two. Straight-chain alkene radicals were characterized by well-resolved hyperfine structure of four or more components. Branched-chain alkene radicals showed more but poorly resolved components. Only those hydrogen atoms attached to carbon atoms at or adjacent to the location of the unpaired electron are found to contribute appreciably to the observed hyperfine structure. Their hyperfine coupling constants are approximately equal. Radical formation and stabilization is attributed to the separation from the parent molecule of highly mobile hydrogen and methyl radicals which diffuse away from the remaining radical fragments, and eventually react with their environment or recombine. Stabilization of remaining fragments then occurs because of immobility and structural resonance. The number of radical spins detected was of the order of 1016 to 1018 in 1-ml samples. Most radicals were stable for weeks at 77°K. Consideration is given to the existence of radicals resulting from secondary hydrogen addition reactions." @default.
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- W2086815199 date "1959-08-01" @default.
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- W2086815199 title "Electron Spin Resonance of Ultraviolet Irradiated Compounds. I. Unsaturated Hydrocarbons" @default.
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- W2086815199 doi "https://doi.org/10.1063/1.1730355" @default.
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