Dependence of Cluster Diffusivity upon Cluster Structure
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
We show that the diffusion coefficient of an adsorbed cluster can be decomposed into two factors, one depending upon a weighted length of the 'active' perimeter and the other depending upon a subtle correlation between hops taken by cluster atoms during diffusion. Both of these factors are structure dependent. Monte-Carlo simulations are performed for clusters on a triangular lattice.