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Collision‐induced dissociation of C 60 − : Effect of energy‐coupling processes on the dissociation dynamics
Author(s) -
Mathur D.,
Brink C.,
Hvelplund P.,
Jensen N.,
Yu D. H.
Publication year - 1995
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.1290090203
Subject(s) - chemistry , dissociation (chemistry) , ion , ionization , chemical physics , atomic physics , collision induced dissociation , molecular dynamics , rotational–vibrational coupling , computational chemistry , molecular physics , molecule , mass spectrometry , tandem mass spectrometry , physics , organic chemistry , chromatography
Dissociation of C 60 −ions induced in 30 keV collisions with atomic and molecular gases has been studied. The pattern of negativeion formation from C 60 −precursors is found to be distinctly different from that obtained for positive‐ion fragments from C 60 +precursors in that the collision‐induced dissociation spectrum in the former case is dominated by small negative clusters, presumably of linear geometry, Simple arguments utilizing the relationship of electrostatic properties of different molecular structures to their electron affinities and ionization energies have been invoked to rationalize these observations. The difference in the dissociation dynamics of C 60 −and C 60 +ions is discussed in terms of competition between different energy‐coupling schemes involving either electronic degrees of freedom or nuclear (vibrational) degrees of freedom.