Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.83: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Solid-liquid surfaces under potential control studied by X-ray diffraction — •Frank Uwe Renner, Yvonne Gründer, and Jörg Zegenhagen — ESRF, BP220, 38043 Grenoble, France

At modern synchrotron radiation sources (e.g. ESRF in Grenoble) it is possible to study structures of surfaces in contact with liquids or electrolytes by in-situ X-ray diffraction with atomic resolution. On a conducting (metal or semiconductor) surface in contact with electrolyte it is possible to control the chemical potential of surface atoms by adjusting the electrical potential. Thus adsorption and desorption processes as well as structural phase changes of the bare crystal surfaces can be initiated close to or far from the 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. Especially for metal alloy and semiconductor systems that have to be prepared by surface science vacuum methods a new UHV transfer electrochemical cell for in-situ X-ray diffraction has been developed using and controlling a droplet of electrolyte solution on the sample surface. We will present latest results for potential induced corrosion of low-index single crystal surfaces of the metal alloy systems Cu-Au and Cu-Pd, as well as metal deposition on semiconductors.