Sputtered metal cluster ions: Unimolecular decomposition and collision induced fragmentation |
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Authors: | W Begemann S Dreihöfer K H Meiwes-Broer H O Lutz |
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Institution: | 1. Fakult?t für Physik, Universit?t Bielefeld, Federal Republic of Germany
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Abstract: | Cluster ions are produced by ion bombardment of thick metal targets and mass selected in a Wien filter. The unimolecular decomposition of Al n + , Cu n + , Mo n + , W n + , and Pb n + is investigated under UHV conditions. The time evolution of the decay allows a glimpse into the cluster formation/fragmentation process. Highly excited metal cluster ions decompose mainly by evaporating single neutral atoms with rates reaching 100%. The collision induced fragmentation (CIF) of stable mass selected metal cluster ions in a low pressure Ar and O2 gas target will be compared to the unimolecular decay. |
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