H or D atom velocities are reported for dissociation from several vibrational levels in the lowest 2500 cm−1 of the Ã 2A state of two vinyl radical isotopomers, C2H3 and CD2CH. Energies are inferred for the acetylene product and compared with both theoretical and experimental work. An upper bound is given for the rate of H-atom scrambling between the α and β carbon atoms.

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