Abstract
Fragmentations of the molecular and fragment ions of methyl stearate, under 70 eV electron ionization (EI) conditions, have been studied by using collision-induced dissociation (CID) and metastable ion decay (MID) techniques. The CID and MID spectra of aged molecular ions Mi+· quite differed from the EI mass spectrum resulted from the in-source fragmentation of initially produced molecular ions M0+· in pattern. The CID spectra of the Mi+· ion mainly showed peaks of m/z 255, 199, and 143 ions, while CID spectra of these 56-Da periodical fragments showed only a preferential product ion at m/z 101. CID spectra of other fragment ions also indicated that the m/z 101 ion is a terminal product. The structure of the ion at m/z 101 has been discussed.
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