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Charge inversion and neutralization–reionization mass spectra of some alkoxide ions
Author(s) -
Mercer Roger S.,
Harrison Alex G.
Publication year - 1987
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210221104
Subject(s) - ion , mass spectrum , fragmentation (computing) , chemistry , alkoxide , spectral line , reionization , collision induced dissociation , mass spectrometry , analytical chemistry (journal) , atomic physics , ionization , physics , tandem mass spectrometry , catalysis , biochemistry , astronomy , organic chemistry , chromatography , computer science , operating system
The charge inversion mass spectra of C 1 to C 3 alkoxide ions have been obtained using He, N 2 and O 2 as collision gases. The three collision gases show similar efficiencies for collisional charge inversion and produce similar mass spectra, although fewer high‐energy oxenium ions are formed when O 2 and N 2 are used as collision gases. Using two collision cells and an intermediate deflector electrode the alkoxide ions have been neutralized in the first collision cell and the fast neutrals ionized in the second cell. The neutralization–reionization mass spectra obtained are similar to the direct charge‐inversion mass spectra indicating that mainly alkoxyl radicals are produced, although, depending on the neutralization collision gas and the alkoxide ion studied, other neutrals are formed in small yields. Deuterium isotopic labelling has been used to show that the main fragmentation reactions of the unstable oxenium ions formed involve 1,1‐elimination of H 2 or an alkane.