Regensburg 2002 – wissenschaftliches Programm
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O: Oberflächenphysik
O 13: Postersitzung (Adsorption an Oberfl
ächen, Elektronische Struktur, Magnetismus in reduzierten Dimensionen, Epitaxie und Wachstum, Halbleiteroberfl
ächen und -grenzfl
ächen, Organische Dünnschichten)
O 13.23: Poster
Montag, 11. März 2002, 18:00–21:00, Bereich C
X ray studies of the surfaces of metal electrodes in electrolyte — •Frank Renner1, Tien Lin Lee1, Samantha Warren1, Jose Angel Martin Gago2, Francesco Borgatti3, Roberto Felici3, and Jorg Zegenhagen1 — 1ESRF BP220 38043 Grenoble — 2ICMM CSIC 28049 Madrid — 3INFM OGG BP220 38043 Grenoble
On a conducting (metal or semiconductor) surface in contact with electrolyte it is possible to control the surface chemical potential via the electrical potential applied to the sample. Thus adsorption and desorption processes as as well as structural changes of the bare crystal surfaces can be initiated close to or far from equilibrium depending on the choice of potential. At the x-ray standing Waves surface science beamline ID32 at the ESRF we are studying these phenomena with newly developed electrochemical cells in situ with x-ray diffraction and x-ray standing waves. We will present results for potential induced structural changes for Sulfur and Thiol adlayers on different low indexed gold surfaces observed by x-ray diffraction. Such Thiol adlayers on metals are important because of their potential technological applications e.g. as corrosion inhibitors. We could trace the response of the substrate surface upon potential controlled adsorption/desorption of the adlayers. Furthermore we will discuss first results on the early stages of corrosion of metal alloys.