Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.58: Poster

Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F

Vibrational features of copper adatoms on Cu(111) — •Diana Vogel, Olaf Skibbe, and Annemarie Pucci — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, D-69120 Heidelberg

It is known that some stepped copper surfaces show vibrational features that are introduced by the steps [1]. The energies of some of these vibrations are higher than those of the bulk phonons. We found with high-resolution electron energy loss spectroscopy (HREELS) similar features by looking at the Cu(111) surface on which we evaporated copper at liquid nitrogen temperature. The behavior of these vibrational features will be shown as a function of the amount of added copper and the annealing temperature, respectively.

The aim of this study is to characterize the roughened surface which can serve as a nano-structured template for the adsorption of molecules. The interaction of adsorbates with the surface is known to be influenced strongly by the presence of defect sites [2].

[1] A. Kara, P. Staikov, and T. S. Rahman, Phys. Rev. B 61, 5714 (2000).

[2] O. Skibbe, M. Binder, A. Otto, and A. Pucci, in preparation.