COMBINED X-RAY AND STM STUDY OF THE OXYGEN-INDUCED RESTRUCTURING OF THEAu(111)SURFACE

L. Ortega, L. Huang, J. Chevrier, P. Zeppenfeld, J. M. Gay, F. Rieutord and G. Comsa
Additional contact information
L. Ortega: ESRF, BP 220, F-38043 Grenoble Cedex, France
L. Huang: IGV, Forschungszentrum Jülich, D-52428 Jülich, Germany
J. Chevrier: ESRF, BP 220, F-38043 Grenoble Cedex, France;
P. Zeppenfeld: IGV, Forschungszentrum Jülich, D-52428 Jülich, Germany
J. M. Gay: CRMC2, CNRS, Campus de Luminy, Case 913, 13288 Marseille Cedex 9, France
F. Rieutord: CEA-DRFMC-S13M, CEA Grenoble, 38054 Grenoble Cedex 9, France
G. Comsa: IGV, Forschungszentrum Jülich, D-52428 Jülich, Germany

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1315-1319

Abstract: Au(111) surfaces exposed to oxygen under high pressure (pO2=1bar) and at high temperature (T≈800°C) during an extended period of time (several hours) exhibit a ($\sqrt 3\times \sqrt 3)$R30° structure and, at larger scales (a few nanometers), a long range hexagonal height modulation with a period of 72 Å. This is evidenced by X-ray diffraction at grazing incidence performed at the ESRF. These results confirm and complete previous surface analysis in direct space by scanning tunneling microscopy (STM). This new evidence for a long range superstructure by X-ray diffraction provides new insights into the origin of the moiré patterns observed in the STM study.

Date: 1997
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DOI: 10.1142/S0218625X97001735

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