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Surface Diffusion of Large Ag Clusters on Ag(100)

Published online by Cambridge University Press:  21 February 2011

J.-M. Wen,
J. W. Evans,
S.-L. Chang,
J. W. Burnett and
P. A. Thiel
J.-M. Wen
Affiliation:
Departments of Chemistry and Mathematics and Ames Laboratory, Iowa State University, Ames, LA 50011 USA
J. W. Evans
Affiliation:
Departments of Chemistry and Mathematics and Ames Laboratory, Iowa State University, Ames, LA 50011 USA
S.-L. Chang
Affiliation:
Departments of Chemistry and Mathematics and Ames Laboratory, Iowa State University, Ames, LA 50011 USA
J. W. Burnett
Affiliation:
Departments of Chemistry and Mathematics and Ames Laboratory, Iowa State University, Ames, LA 50011 USA
P. A. Thiel
Affiliation:
Departments of Chemistry and Mathematics and Ames Laboratory, Iowa State University, Ames, LA 50011 USA
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Abstract

Scanning tunneling microscopy has shown that large, two-dimensional Ag clusters undergo observable diffusion on Ag(100). The variation of the diffusion coefficient with cluster size in the range studied, 100 to 540 atoms per cluster, indicates that two-dimensional evaporation-condensation is the main mechanism of cluster diffusion. The experimental data consistently show evidence for a backward-correlation in the cluster motion. The meaning and origin of this correlation is discussed.

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