Enhanced cluster mobilities on Pt(111) during film growth from the vapor phase
作者:
V. Chirita,
E. P. Mu¨nger,
J.-E. Sundgren,
J. E. Greene,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 72,
issue 1
页码: 127-129
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.120664
出版商: AIP
数据来源: AIP
摘要:
We use molecular dynamics simulations to follow the dynamics of small two-dimensional Pt clusters on Pt(111) at 1000 K. While close-packedPt7heptamers are extremely stable structures, the addition of a single cluster vacancy or an on-top adatom immediately results in intracluster bond breaking, reconfigurations, rotations, the introduction of stacking faults, and greatly enhanced cluster diffusion rates. Mapping center-of-mass motion for total simulation times >145 ns revealed increases in cluster velocities by more than an order of magnitude with cluster migration occurring primarily by concerted motion and a novel diffusion mechanism involving double shearing of dimers/trimers. Contrary to some previous reports, edge-atom diffusion plays only a minor role. ©1998 American Institute of Physics.
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