Adsorption of carbon monoxide on Au(1 1 0)-(1 × 2)

J. M. Gottfried, K. J. Schmidt, S. L M Schroeder, K. Christmann

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The adsorption of carbon monoxide on a gold (110)-(1 × 2) surface was studied between 28 and 300 K by means of TDS, UPS, ΔΦ, NEXAFS, and LEED. Below 150 K, CO adsorbs non-dissociatively with high initial sticking probability (S0 = 0.9 at 28 K). The isosteric heat of CO adsorption is 59 kJ/mol for ΘCO → 0 and decreases strongly with coverage, indicating weak chemisorption and substantial CO-CO repulsion, in agreements with TDS results. Thermal desorption spectra show at least five desorption states corresponding to desorption energies between 38 and 8 kJ/mol. According to TDS, chemisorbed and physisorbed CO coexist in the first layer, a result that is corroborated by UV photoemission spectra. CO adsorption has a complex influence on ΔΦ and leads to a work function reduction of -0.95 eV at monolayer coverage. TDS and entropy measurements suggest that the state of chemisorbed CO at 160 K is best described by the model of a two-dimensional gas. No ordered CO overlayer structures were observed in the whole coverage and temperature range. © 2003 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)206-224
    Number of pages18
    JournalSurface Science
    Volume536
    Issue number1-3
    DOIs
    Publication statusPublished - 20 Jun 2003

    Keywords

    • Carbon monoxide
    • Chemisorption
    • Gold
    • Near edge extended X-ray absorption fine structure (NEXAFS)
    • Photoelectron spectroscopy
    • Physical adsorption
    • Thermal desorption spectroscopy
    • Work function measurements

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