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On the formation of rotationally hot H 2 +. by dissociation of CH 4 2+ dications
Author(s) -
Krishnamurthi Vidhya,
Mathur D.,
Evans G. T.,
Harris Frank
Publication year - 1991
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290051113
Subject(s) - chemistry , dissociation (chemistry) , ion , kinetic energy , rotational energy , excitation , atomic physics , mass spectrometry , fragmentation (computing) , bond dissociation energy , physics , organic chemistry , quantum mechanics , chromatography , computer science , operating system
Dissociation of CH 4 2+into CH 2 +·ion pairs results in formation of H 2 +·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 2 +·ions are generated from H 2 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 4 2+with the observation of the rotational resonances. There is good accord between the experimental results and the prediction of our models.