Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Metal Substrates: Adsorption III
O 51.2: Vortrag
Donnerstag, 29. März 2007, 11:30–11:45, H39
The Pd(110)-(3x2)-O surface phase investigated by STM and DFT — •Marko Kralj1,3, Tobias Pertram1, Nicola Seriani2, Aleksander Krupski1, Conrad Becker1, Georg Kresse2, and Klaus Wandelt1 — 1Institute of Physical Chemistry, University of Bonn — 2Institute for Material Physics, University of Vienna — 3Institute of Physics, Zagreb
The catalytic activity of palladium has intrigued researchers to study the interaction of gases with its surfaces for many decades. The complexity of the O-Pd(110) interaction manifests itself in a number of observed surface phases, which depend on oxygen exposures and various surface temperatures. According to LEED measurements six different structures have been reported and surface oxide formation is accompanied by a missing-row restructuring. This type of reconstruction is generally observed with bare and adsorbate covered (110) surfaces of similar metals and is believed to be the most stable reconstruction because it is accompanied by the formation of (111) micro-facets.
Most data about the system have been published in relation to the c(2x4) phase which is easy to prepare and it seems to dominate the phase diagram. Consequently, not much is known about other oxygen overlayer structures. In this study we have used STM in combination with DFT in order to further explore the O/Pd(110) phase diagram. In particular, we have concentrated on the Pd(110)-(3x2)-O surface oxide which corresponds to a low oxygen coverage. Measured and calculated data are in very good agreement and indicate that oxygen atoms are adsorbed in three-fold hollows of the reconstructed surface.