Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.37: Poster
Montag, 25. Februar 2008, 18:30–19:30, Poster F
Adsorbate-adsorbate interactions at electrochemical interfaces: S/Cu(001) in HCl solution — •Andriy Taranovskyy, Tunay Tansel, and Olaf Magnussen — Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel, Germany
Following up our previous high-speed scanning tunneling microscopy study of sulfide tracer diffusion on Cu(001) in 0.01M HCl solution [1], we here present an analysis of the mutual motion of sulfide dimers in this system at room temperature. From the experimental video data histograms of the changes of the atomic configurations in subsequent frames were obtained. By fitting those to a theoretical model of dimer motion, based on solution of master equations, the hopping rates of Sad in the presence of a neighboring Sad were extracted. The pair interaction potential obtained from these rates shows an oscillatory distance dependence indicating anisotropic interactions. Also an influence of the electrode potential on the adsorbate interactions was observed.
[1] T. Tansel and O. Magnussen, Phys. Rev. Lett. 96, 026101 (2006).