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Organic ions in the gas phase—XXI. Competitive primary loss of C 2 H 4 and CO from 1‐tetralone under electron impact
Author(s) -
Meyerson Seymour,
Vander Haar R. W.
Publication year - 1968
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.1210010308
Subject(s) - ion , analytical chemistry (journal) , chemistry , intensity (physics) , atomic physics , resolution (logic) , gas phase , physics , optics , organic chemistry , artificial intelligence , computer science , chromatography
Competing primary reactions by which 1‐tetralone loses C 2 H 4 and CO give rise to a doublet at mass 118 in the high‐resolution mass spectrum corresponding to 96·4% C 8 H 6 O + and 3·6% C 9 H 10 + , respectively. Study of the remainder of the spectrum however, suggests that these intensities constitute a poor measure of the relative importance of the two reaction paths. The C 9 H 10 + ion evidently degrades more readily than C 8 H 6 O + , since an estimated 26% of the ions arising in these paths involve primary loss of CO. This estimate is supported by voltage dependence of the intensity distribution between the members of the doublet. As ionizing voltage is decreased, the intensity distribution is constant to about 20 volts, but between 20 and 10 volts the value for C 9 H 10 + rises smoothly from about 3.5% to about 25%.