Abstract
Photofragment translational spectroscopy has been implemented to obtain correlated final state distributions for the acetylene−HCl complex. Vibrational predissociation is induced by exciting the asymmetric acetylene C−H stretching vibration. In contrast with previous studies of this system, which suggested that the primary dissociation channel involves intermolecular V−V energy transfer (resulting in the production of v = 1 HCl), the present study shows that the dominant channel involves intramolecular V−V energy transfer, with the majority of the excess energy remaining with the acetylene subunit. In fact, the dissociation energy determined in the present study, D0 = 830 ± 6 cm-1, indicates that the HCl (v = 1) channel is closed.
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