Abstract
The yield of D2 formed by a unimolecular process in the γ-ray irradiation of cyclohexane-d12 has been deduced from the isotopic composition of hydrogen evolved from C6H12–C6D12 mixtures. A value of 0.25 molecule/100 ev is found for this "molecular" yield. This yield is only slightly reduced by iodine but is considerably reduced in the presence of biphenyl.

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