X-RAY PHOTOELECTRON DIFFRACTION STUDY OF A LONG-RANGE-ORDERED ACETATE LAYER ON Ni(110)

M. Nowicki, A. Emundts, J. Werner, G. Pirug and H. P. Bonzel ()
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M. Nowicki: Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
A. Emundts: Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
J. Werner: Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
G. Pirug: Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
H. P. Bonzel: Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany

Surface Review and Letters (SRL), 2000, vol. 07, issue 01n02, 25-36

Abstract: An investigation of acetic acid adsorption on Ni(110) at room temperature by LEED and X-ray photoelectron diffraction reveals a well-orderedc(2 × 2)acetate overlayer with a molecular coverage near 0.5. Large solid angle maps of angle-resolved C 1s and O 1s intensities from this layer show intense maxima due to electron forward scattering by nearby atoms, either of the same acetate or of neighboring acetate species. The data provide strong evidence for acetate in a bidentate configuration, bonded through both oxygen atoms to the surface and aligned along the$[1{\bar 1}0]$surface azimuth. A real space model for thec(2 × 2)acetate layer has been derived and single scattering cluster calculations for this model layer have been carried out for C 1s and O 1s emissions. Allowing for changes in intramolecular bond length of the acetate relative to those in a Ni-acetate complex, good agreement between experimental and theoretical C 1s and O 1s distributions was obtained.

Date: 2000
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DOI: 10.1142/S0218625X00000063

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