Single Jump Mechanisms for Large Cluster Diffusion on Metal Surfaces

Single Jump Mechanisms for Large Cluster Diffusion on Metal Surfaces

The random motion of large, two-dimensional adatom clusters and vacancy clusters over a metal surface is described by a diffusion coefficient {ital D}{proportional_to}{ital d}{sup {minus}{ital n}}, where {ital d} is the diameter of the cluster and the integer {ital n} identifies the diffusion mechan...

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Veröffentlicht in:Physical Review Letters 1995-08, Vol.75 (8), p.1574-1577
1. Verfasser: Van Siclen, Clinton DeW
Format: Artikel
Sprache:eng
Schlagworte:
ADSORPTION
ATOMIC CLUSTERS
DIFFUSION
MATERIALS SCIENCE
METALS
MORPHOLOGY
SURFACE PROPERTIES
VACANCIES
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description The random motion of large, two-dimensional adatom clusters and vacancy clusters over a metal surface is described by a diffusion coefficient {ital D}{proportional_to}{ital d}{sup {minus}{ital n}}, where {ital d} is the diameter of the cluster and the integer {ital n} identifies the diffusion mechanism. For {ital circular} clusters, {ital n}=3 when center-of-mass motion occurs by adatom diffusion along the periphery of the cluster, while {ital n}=2 or 1 when cluster diffusion occurs by {ital correlated} or {ital uncorrelated} adatom evaporation and condensation, respectively. A {ital faceted} adatom cluster diffuses by evaporation and condensation of facet ledges, giving {ital n}=0 when cluster diffusion is determined by the rate at which erosion of a ledge is initiated.
doi_str_mv 10.1103/physrevlett.75.1574
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source American Physical Society Journals
subjects ADSORPTION
ATOMIC CLUSTERS
DIFFUSION
MATERIALS SCIENCE
METALS
MORPHOLOGY
SURFACE PROPERTIES
VACANCIES
title Single Jump Mechanisms for Large Cluster Diffusion on Metal Surfaces
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