Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 6: Grenzfl
äche fest-flüssig

O 6.3: Vortrag

Freitag, 4. März 2005, 11:15–11:30, TU EB407

Quantitative in-situ Video-STM study of the lateral displacements of isolated reconstruction strings on Au(100) electrodes — •Miguel Labayen, Christian Haak, and Olaf Magnussen — Institut fur Experimentelle und Angewandte Physik, Leibnizstrasse 19, Universitaet Kiel, Kiel 24098, Deutschland

The dynamic behavior of the reconstructed Au(100) surface has been studied in Cl- containing solution via in-situ electrochemical high-speed scanning tunneling microscopy (Video-STM), at image acquisition rates of 15 - 20 frames per second. The Au(100)(1x1) surface structure undergoes reconstruction of the top-most layer to a hexagonal close-packed structure at negative potentials. The elemental units of this reconstructed surface are parallel strings separated 14.5 Å. We have focused our study to the high mobility of isolated strings perpendicular to the main direction[1]. Jump distribution functions for individual strings indicate contributions by at least two different processes (jumps by one and two atomic distances). String jumps can be ascribed to small atomic displacements in the strings induced by propagating kinks. The mechanisms of kink nucleation and propagation and the corresponding energy barriers, obtained from temperature-dependent measurements, are discussed.

[1] M.Labayen, C.Ramirez, W.Schattke, O.M.Magnussen, Nature Materials 2, 783 (2003).