Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Solid-Liquid Interfaces: Reactions and Electrochemistry

O 72.1: Poster

Mittwoch, 9. März 2016, 18:15–20:30, Poster A

Measurement of surface diffusion at solid-liquid interfaces using in situ linear optical diffraction — •Lasse Kattwinkel, Christoph Lemke, and Olaf Magnussen — Insitut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel

Surface diffusion at solids in liquid environment is a fundamental process in many interface reactions, but much less understood than surface diffusion under vacuum conditions. We develop a novel method to measure the surface diffusion rates in such systems using optical diffraction. In this method a density grating in an adsorbate layer is created by thermal desorption induced by the two interfering beams of a nanosecond Nd:YAG laser. The evolution of the grating is then probed by linear optical diffraction of a HeNe laser beam at the grating. From the exponential decrease of the diffraction intensity the surface diffusion coefficient can be extracted. We describe the setup for this novel in situ technique and first experimental results.