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O: Fachverband Oberflächenphysik

O 73: Surface Dynamics: Reactions and Elementary Processes

O 73.17: Poster

Wednesday, March 9, 2016, 18:15–20:30, Poster A

Pump-probe photoemission spectroscopy of O₂ on Pt(111) at a Free-Electron Laser — •Giuseppe Mercurio¹, Lukas Wenthaus¹, Florian Hieke¹, Henrike Hümpel¹, Günter Brenner², Harald Redlin², and Wilfried Wurth^1,2 — ¹Physics Department and Center for Free-Electron Laser Science, University of Hamburg, Hamburg, Germany — ²DESY Photon Science, Hamburg, Germany

The interaction of oxygen with the platinum surface has been the subject of extensive experimental and theoretical studies in the last decades because of its technological relevance in many catalytic reactions. In order to improve heterogeneous catalysis at surfaces to achieve more efficient catalysts and less undesired by-products it is essential to gain a microscopical understanding of fundamental chemical reactions. To this purpose we investigate chemisorbed oxygen molecules on a Pt(111) surface by means of time-resolved photoemission spectroscopy in a pump-probe experiment. We used as pump fs laser pulses at 800 nm and as probe free-electron laser pulses from FLASH at DESY in Hamburg at 566 eV. In this way the dynamics of the adsorbed molecule and the energy exchange with the surface leading to the excitation of the adsorbates could be investigated with a time resolution better than 500 fs for several ps after the absorption of the pump pulse at the surface.