Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.61: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

Fast XPS - monitoring surface reactions in the microsecond regime — •Oliver Höfert, Max Amende, Stefan Schernich, Christoph Gleichweit, Christian Papp, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

High temperatures and low coverages are hard to handle in reaction studies under surface science conditions and the respective analytical methods, due to the short characteristic reactions timescales. In this study, we show that by improving the time resolution of photoelectron spectroscopy, we can follow surface reactions at high temperatures in the microsecond regime. This is realized by recording the signal at selected (and characteristic) binding energies as function of time. By using a periodic dosing procedure and subsequent adding up of the resulting data sufficient signal to noise ratio is obtained. Further improvements towards an even better time resolution are envisioned. As a first test case the adsorption and desorption of CO on Pt(111) was studied at temperatures between 460 K and 500 K with a time resolution of 500 µs. The experiments have been performed at the synchrotron facility BESSY II.

This work was supported by BMBF (05 ES3XBA/5) and the DFG through the Cluster of Excellence ”Engineering of Advanced Materials”.