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Reptation: a mechanism for cluster migration on (111) face-centered-cubic metal surfaces
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
1999 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 436, no 1-3, L641-L647 p.Article in journal (Refereed) Published
Abstract [en]

Embedded-atom molecular-dynamics simulations were used to follow the diffusion dynamics of compact platinum clusters with up to 19 atoms on Pt(lll). The results reveal a cluster diffusion mechanism on (111) face-centered-cubic (fcc) surfaces involving successive shear translations of adjacent subcluster regions giving rise to reptation, a snake-like gliding motion. We show that for compact clusters with <7 atoms, this mechanism competes energetically with that of island diffusion through concerted motion. However, for cluster sizes of between 8 and similar or equal to 20 atoms, reptation becomes energetically favorable, especially for elongated clusters. Reptation is also shown to be an important migration mechanism for fractal (randomly ramified) and dendritic (symmetrically branched) islands. (C) 1999 Elsevier Science B.V. All rights reserved.

Place, publisher, year, edition, pages
1999. Vol. 436, no 1-3, L641-L647 p.
Keyword [en]
atomistic dynamics; clusters; molecular dynamics; platinum; surface diffusion
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-105974DOI: 10.1016/S0039-6028(99)00715-3OAI: oai:DiVA.org:liu-105974DiVA: diva2:712808
Available from: 2014-04-16 Created: 2014-04-15 Last updated: 2017-12-05

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Chirita, ValeriuMünger, PeterGreene, Joseph E

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