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Mass spectra of vinyltrimethylsilane and vinyltri(methyl‐ d 3 ) silane
Author(s) -
Smolinsky G.,
Vasile M. J.
Publication year - 1973
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.1210070907
Subject(s) - electron ionization , mass spectrum , ion , chemistry , mass spectrometry , analytical chemistry (journal) , quadrupole mass analyzer , ionization , silane , mass , ionization energy , atomic physics , physics , organic chemistry , chromatography
This paper reports the mass spectrum of vinyltrimethylsilane over the range of electron‐impact energy of 9 to 70 eV as determined with a quadrupole mass spectrometer. Less extensive data obtained with magnetic spectrometers are included for comparison as well as the spectrum of vinyl‐tri(methyl‐ d 3 )silane. Plots of ion intensity as a function of electron energy, nominal appearance potentials and metastable ion transitions are given. The primary ionization results in an electron deficiency on the silicon atom, followed by loss of either ·CH 3 , C 2 H 4 or ·C 2 H 3 to give fragments of mass 85, 73 or 72, respectively. The primary fragment of mass 85 loses C 2 H 2 to give the mass 59 ion. The primary fragment of mass 73 loses successively C 2 H 4 and H 2 to give first the mass 45 ion and then the mass 43 ion. At 15 eV, the relative intensities of the ions are 85 > 72 > 100 > 59 > 73. At 70 eV, the relative intensities are 59 > 85 > 43 > 45 > 73 > 72 > 100.