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Atomic Interactions and the Stability of Surface Clusters

Published online by Cambridge University Press:  10 February 2011

Seong Jin Koh  and
Gert Ehrlich
Seong Jin Koh
Affiliation:
Materials Research Laboratory and Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 104 S. Goodwin Ave., Urbana, IL 61801
Gert Ehrlich
Affiliation:
Materials Research Laboratory and Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 104 S. Goodwin Ave., Urbana, IL 61801
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Abstract

Interactions dictating the shape and stability of surface islands have been examined for a simple model system, palladium clusters on the W(110) plane. Observations in a field ion microscope of the distribution of two Pd adatoms over the surface yield quantitative values for pair interactions. These are found to be complex, extending over distances longer than 10 A and to vary strongly with the orientation of the pair axis on the (110) surface. Using the measured pair energies it has been possible to infer the magnitude of many-atom effects necessary to account for the equilibrium shape of the clusters. Many-atom interactions turn out to make by far the largest contribution to cluster cohesion; modeling of growth phenomena in terms of nearest-neighbor bonds only is clearly problematic.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 528: Symposia AA – Mechanisms & Principals of Epitaxial Growth in Metallic Systems , 1998 , 37
Copyright
Copyright © Materials Research Society 1998

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