Abstract
The metastable fragmentation of the (C 4H 10 n C 4H + 7 cluster ions produced by the electron impact ionization of neutral n-butane clusters has been studied with a double-focussing sector field mass spectrometer. In addition to the usual statistical single-monomer evaporation, (C 4H 10 n C 4H + 7 cluster ions were found to exhibit a more complex metastable decay pattern, involving evaporation of 2–4 and 4–7 C 4H 10 monomers. A mechanism based on energy storage in metastable isomers of C 4H + 7 within the butane cluster ion is suggested to be responsible for the unusual metastable fragmentation pattern of (C 4H 10) n C 4H + 7 cluster ions.
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