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The fragmentation dynamics of small Cs(CsI)(n)(+) cluster ions under low-energy multiple collision conditions



The collision-induced dissociations of small caesium iodide cluster ions of the type Cs(CsI)(n)(+) where n = 3-7, have been investigated under low-energy multiple collision conditions. The collisions were performed in the rf-only quadrupole of a BEqQ hybrid mass spectrometer. Breakdown graphs of selected parent ions were obtained by varying the laboratory collision energy in the range of 0-400 eV. The fragmentation dynamic established under these conditions provides a link between the well-known decay behaviour occurring unimolecularly and the dissociations following high energy (keV) collisional activation. Of particular interest is the observation that the energy-dependent dissociation pattern supplies support for the occurrence of one-step fission reactions, featuring the evaporation of presumably intact (CsI)(n) neutrals as opposed to a sequential decay via nCsI losses. The breakdown graphs thus provide a valuable tool to enhance insight into the fragmentation mechanism of these clusters. (C) 2004 Elsevier B.V. All rights reserved

Topics: QC
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