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A comparison of three experimental techniques for ion structure studies via collision‐induced reactions: The [C 5 H 8 ] + ˙ example
Author(s) -
Curtis J. M.,
Brenton A. G.,
Bcy J. H.,
Boyd R. K.
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.1210221205
Subject(s) - ion , chemistry , kinetic energy , collision induced dissociation , atomic physics , mass spectrometry , dissociation (chemistry) , collision , analytical chemistry (journal) , fragmentation (computing) , ionization , electron capture , polyatomic ion , tandem mass spectrometry , physics , computer security , organic chemistry , chromatography , quantum mechanics , computer science , operating system
Structure differentiation between [C 5 H 8 ] + ˙ ions, formed by electron ionization of various precursors, has been used as a test case for comparison of three experimental techniques involving collision‐induced dissociation (CID). Low‐energy CID in an rf‐only quadrupole collision cell has been studied in the range 1–150 eV laboratory collision energy. These data have been compared with those obtained using mass‐analyzed ion kinetic energy spectroscopy at 8 keV energy, and with results from dissociative charge‐stripping (DCS) coupled with a second electron capture collision (EC) in order to remove intense interferences (DCS/EC). The greatest degree of structure differentiation was possible using the DCS/EC technique. The other two methods were comparable in this regard, although effects of pre‐collision internal energy was apparent for collision energies much below 30 eV. Day‐to‐day reproducibility of spectra was most difficult to obtain for the low‐energy CID technique. Of the [C 5 H 8 ] + ˙ ions thus tested, the isoprene molecular ion was clearly the best match to the fragment ion formed from limonene.