Abstract
Collision-induced dissociation—mass-analysed ion kinetic energy (CID—MIKE) spectrometry has been applied to the characterisation of butyl cations produced by decomposition of some metastable precursor ions using a triple-sector ( E/B/E) mass spectrometer. Significant differences are observed in the fragmentation when acylium ions are used to generate the isomeric butyl cations. The formation of various mixtures of t-butyl and s-butyl ions is proposed to explain these differences. The structure of butyl ions generated from metastable oxonium ions has also been investigated. The results indicate the predominant formation of t-butyl ions in this case.
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