The yield of those species produced in X-irradiated hydrocarbon-iodine solutions which give rise to I3upon the subsequent addition of ethanol has been measured. While it has been generally assumed that I2 reacts with thermal hydrogen atoms, it is suggested here that in fact I2 reacts preferentially with electrons and that G(I3~) = G(e"). This view is in part suggested by the behavior of solutions to which alcohols are added prior to irradiation. The extrapolated yields of Cr(l3~) in n-hexane, cyclohexane, and 3-methylpentane are 2.42,1.94, and 1.56, respectively.
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