Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)

O 36.19: Poster

Montag, 7. März 2005, 15:00–18:00, Poster TU F

In-situ Video-STM study of the dynamic behavior of the reconstructed Au(100) surface. — •Christian Haak, Miguel Labayen, and Olaf M. Magnussen — Institut für Experimentelle und Angewandte Physik, Universität Kiel, Leibnizstr. 19, 24098 Kiel

The dynamic of five atomic rows wide, hexagonally arranged strings has been studied by Video-STM on a Au(100) surface in sodium sulphate and hydrochloric acid containing solution. Those No-dqhexNo-dq-strings appear during the phase transition from the Au(100)(1x1) to the No-dqhexNo-dq reconstruction of the top-most layer when applying negative potential. We have studied the initial stages of the formation of individual strings, the growth of the strings and the formation of larger domains. Isolated No-dqhexNo-dq-strings exhibit highly dynamic fluctuations in structure and position. They show a high mobility perpendicular and parallel to the string direction. Surprisingly, the mobility perpendicular to the string direction is independent from string length. This can be explained by simple models where the string moves due to nucleation and propagation of kinks. Furthermore, we discuss potential- and temperature-dependent measurement, which show that the string mobility increases towards more negative potentials and is thermally activated.