Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Metal substrates: Adsorption of O / H and inorganic molecules I
O 12.5: Vortrag
Montag, 14. März 2011, 16:00–16:15, WIL A317
In-situ oxidation study of Pd(100) by surface x-ray diffraction — •Volkan Kilic1, Natalia Martin2, Miguel Mantilla3, Dirk Franz1, Edvin Lundgren2 und Andreas Stierle1 — 1AG Grenzflächen, Universität Siegen, Germany — 2Department of Synchrotron Radiation Research,Lund University,Sweden — 3MPI für Metallforschung, Stuttgart, Germany
The oxidation of the Pd(100) surface at oxygen pressures in the 10−6 mbar to 103 mbar range and temperatures up to 1000 K has been studied in-situ by surface x-ray diffraction (SXRD). The SXRD experiments were performed at the MPI beamline at the Angstrom Quelle Karsluhe (ANKA). We present the surface and crystal truncation rod (CTR) data from the (√5X√5) surface layer. We show that the transformation from the surface oxide to PdO bulk oxide can be observed in-situ under specific pressure and temperature conditions. We will compare our results with previously proposed structure models based on low energy electron diffraction (LEED) I(V) curves and density function theory calculations [1,2].
Finally, we will elucidate the question of commensurability of the surface oxide layer with respect to the Pd(100) substrate.
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