Ag adatom and dimer motion on Cu(1 1 0)(1 x 2) missing row surface

    Authors

    K. Sbiaai; A. Eddiai; Y. Boughaleb; A. Hajjaji; M. Mazroui;A. Kara

    Comments

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    Abbreviated Journal Title

    Opt. Mater.

    Keywords

    Embedded adatom method; Molecular dynamics simulations; Diffusion; Small; cluster; Copper; Silver; SELF-DIFFUSION; BROWNIAN PARTICLES; DYNAMICS; GROWTH; JUMPS; POTENTIALS; MECHANISM; METALS; COPPER; ATOMS; Materials Science, Multidisciplinary; Optics

    Abstract

    The diffusion of Ag monomer and dimer on Cu(1 1 0)(1 x 2) missing row reconstructed surface is investigated by using the molecular dynamics simulation based on semi-empirical many-body potentials derived from the embedded atom method. In the case of monomer diffusion, both simple jump and long jump follow an Arrhenius law in a large temperature range (300-500 K) but with a small difference in activation energy. The activation barrier energy for simple jump is found to be (0.27 +/- 0.02) eV with corresponding prefactor 5.9 ps(-1). However, for double jump we found E-a2 = (0.33 +/- 0.05) eV. While in the case of dimer, we found that the adatoms activity is notably reduced at low temperature (T < 400 K) and the diffusion via dissociation-reassociation process is more favoured than the other processes. This finding is in a good agreement with the energetic prediction. The presence of concerted jump and leapfrog process is very rare due to their high corresponding activation energy. (C) 2013 Elsevier B.V. All rights reserved.

    Journal Title

    Optical Materials

    Volume

    36

    Issue/Number

    1

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    42

    Last Page

    46

    WOS Identifier

    WOS:000327232600009

    ISSN

    0925-3467

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