Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.88: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Vibrational Spectroscopy of Adsorbates on Roughened Cu(1 1 1) — •Olaf Skibbe, Diana Vogel, and Annemarie Pucci — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg
Rough surfaces are known to provide properties different from those found on low-index pristine single crystal surfaces. These defect determined properties are often responsible for the chemical activity of the surface in heterogeneous catalysis. In this work we present vibrational spectra taken with high-resolution electron energy loss spectroscopy (HREELS) of different adsorbates (e.g. CO, C2H4) on roughened Cu(1 1 1). The roughening was performed by evaporating small amounts of copper on the cooled Cu(1 1 1) surface. In addition, we performed measurements of the work function change by using the highly monochromated electron beam of the HREELS in the retarding potential method. The structure of the I(U) curve can be assigned to different morphologies of the substrate.