Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 89: Metal Substrates: Epitaxy and Growth

O 89.9: Vortrag

Freitag, 29. Februar 2008, 11:30–11:45, MA 041

Zn/Pd(111) - Adlayer versus Alloy Formation: An Investigation by Low-Energy Ion Scattering — •Werner Stadlmayr and Norbert Memmel — Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria

The system Zn/Pd(111) has recently attracted attention due to its relevance for methanol steam reforming. However, conflicting growth modes were reported in XPS studies [1] and TPD/CO-titration investigations [2], respectively. While the former work postulates the onset of alloy formation already slightly above room temperature, the latter work excludes alloy formation below 600 K. We apply low-energy ion scattering spectroscopy with monolayer sensitivity to clarify this issue. [1] A. Bayer, K. Flechtner, R. Denecke, H.P. Steinrueck, K.M. Neyman, N. Roesch, Surf. Sci. 600, 78 (2006). [2] H. Gabasch, A. Knop-Gericke, R. Schloegl, S. Penner, B. Jenewein, K. Hayek, B. Kloetzer, J. Phys. Chem B 110, 11391 (2006).