Premium
Evidence for a reaction window in double‐electron‐capture reactions in collisions involving the molecular target CH 3 Br
Author(s) -
Langford M. L.,
Harris F. M.
Publication year - 1990
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.1290040408
Subject(s) - chemistry , ion , excited state , projectile , electron capture , atomic physics , molecule , population , electron , spectral line , physics , nuclear physics , demography , organic chemistry , quantum mechanics , astronomy , sociology
Double‐electron‐capture reactions in which singly charged projectile ions A + convert to negative ions A − in collisions with molecules M are endoergic. Non‐zero cross‐sections for the reactions occur when the endoergicities fall within a ‘reaction window’. The existence of a window for reactions with CH 3 Br molecules is demonstrated in this investigation by altering the population of ground and excited states of the resulting CH 3 Br 2+ ions using three projectile ions, S + ˙, OH + and F + which markedly alters the endoergicities of the double‐electron‐capture reactions. Analysis of the energy‐loss spectra indicates that the reaction window for CH 3 Br is between endoergicities of about 8 and 22 eV. Using F + as the projectile ion, it is shown that the population of the more highly excited states of CH 3 Br 2+ is enhanced.