Abstract
Dissociation of CH into CH ion pairs results in formation of H ions possessing a degree of rotational excitation which is high enough to enable formation of several rotational resonance states. These resonances give rise to unimolecular dissociation into H+ + H· fragments. Ion translational energy spectrometry has been applied to measure such dissociation spectra, and a number of rotational resonances are observed. Rotational resonances are not observed when H ions are generated from H2 precursors. Two models based upon ideas of impulsive energy release are investigated which attempt to correlate the centre-of-mass kinetic energy released upon dissociation of CH with the observation of the rotational resonances. There is good accord between the experimental results and the prediction of our models.
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