Abstract
Low energy ion beam techniques have been used to perform a detailed study of the reactions of Al+ 25 and Si+ 25 with a range of simple molecules (D2, CH4, O2, C2H4, CO and N2). The reactions were studied over a center of mass collision energy range from 0.2 eV up to 7 eV. Activation barriers for chemisorption onto the clusters were deduced from the experimental results. The activation barriers for chemisorption on Al+ 25 and Si+ 25 are generally similar and show a qualitative correlation with the electronic properties of the reactant molecule. However, the products of the chemical reactions of Al+ 25 and Si+ 25 which result from cluster fragmentation are quite different. Si+ 25 shows a tendency to undergo fission as observed in a number of recent studies of the dissociation of the bare clusters.
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