Transition metal induced ringcluster structures on Si (111) Six structures for the Si 45 cluster are compared using a tight-binding model. Two new structures are proposed which appear to be the low-energy isomers and to explain much of the existing experimental data. Cluster reactivity is distinguished from cluster stability, and several reasons are discussed which may lead to a reactive or unreactive species. These criteria are applied to the Si 45 isomers, and the results are also correlated with experimental data. 8552 J.
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