Abstract
Unimolecular metastable ion decompositions of acetyltrimethyl silane, CH 3 COSi(CH 3 ) 3 (MW: 116, (1)) generated by electron ionization, have been investigated by use of mass-analyzed ion kinetic energy (MIKE) spectrometryand D-labeling. In the metastable time window, the molecular ions 1 + decompose exclusively into the ions at m/z 101, [M-CH 3 ] + . A considerable extent of H/D exchange occurs prior to this [M-CH 3 ] + formation. However, the H/D exchange is hardly observed for the [M-CH 3 ] + formation in the ion source. The generated m/z 101 ions from 1 + consist of two isomeric ions. A trimethylsilyl ion, (CH 3 ) 3 Si + , at m/z 73 is generated by at least three different routes.
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