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The unimolecular dissociation of the molecular ion of acetophenone induced by thermal radiation
Author(s) -
Sena Marcelo,
Riveros José M.,
Nibbering N. M. M.
Publication year - 1994
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.1290081225
Subject(s) - chemistry , acetophenone , dissociation (chemistry) , ion , photochemistry , computational chemistry , organic chemistry , catalysis
The molecular ion of acetophenone is shown to undergo unimolecular dissociation to the benzoyl cation in an ICR cell at low pressures and in the vicinity of 333 K with rate constants in the range of 2 to 4 s −1 . Pressure and temperature dependence of this process reveal that the process is primarily induced by absorption of thermal radiation driving ions to energies above the dissociation limit. Collisional effects also enhance this dissociation by a mechanism that attempts to restore a full Boltzmann distribution of the molecular ions.