Cluster motion on metals: Ir on Ir(111)
- 15 November 1989
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 91 (10), 6535-6536
- https://doi.org/10.1063/1.457658
Abstract
Diffusivities have for the first time been quantitatively measured for two-dimensional clusters of iridium atoms on a metal surface, Ir(111). As cluster size increases from two to seven atoms, the diffusivity generally diminishes, but tetramers are an exception. It is shown that their high mobility comes about because of weak interatomic binding, and a low activation energy for diffusion, rather than from a change in the mechanism of motion, which involves displacements of individual adatoms independent of cluster size.Keywords
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