An ordered surface alloy formed by attractive interaction between coadsorbates: C (2 × 2) on Cu(0 0 1) by Mg and Bi

Tetsuroh Shirasawa, Ming Shu Chen, Seigi Mizuno, Hiroshi Tochihara

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    7 Citations (Scopus)

    Abstract

    The coadsorption of dissimilar metals, Mg and Bi, on Cu(0 0 1) at room temperature was studied using low energy electron diffraction (LEED). Five LEED patterns were observed at various coverages: c(2 × 2), c( 4√2 × 2√2)R45°, c(6 × 4), c(6 × 6) and p(4 × 4). The c(2 × 2) structure was determined by a tensor LEED analysis. Mg atoms substitute for every second Cu atom in the top layer, and Bi atoms are located at the on-top sites of the remaining surface Cu atoms. The structure parameters demonstrate that Bi atoms pull up Mg atoms located in the substitutional sites, indicating a direct, attractive interaction between coadsorbates. Reasons for the formation of the c(2 × 2) structure are discussed in comparison with the surface structures formed by the individual adsorption of Mg and Bi.

    Original languageEnglish
    Pages (from-to)L307-L312
    JournalSurface Science
    Volume530
    Issue number1-2
    DOIs
    Publication statusPublished - Apr 20 2003

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

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