Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 67: Competition for the Gerhard Ertl Young Investigator Award
O 67.5: Vortrag
Donnerstag, 14. März 2013, 12:30–13:00, H45
Surface-aligned femtochemistry: Uni- and bimolecular reaction dynamics on oxide surfaces — •Mihai E. Vaida1, Thorsten M. Bernhardt2, and Stephen R. Leone1 — 1Departments of Chemistry and Physics, University of California and Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States — 2Institute of Surface Chemistry and Catalysis, University of Ulm, 89069 Ulm, Germany
The breaking and making of chemical bonds in molecules attached to a substrate constitute the elementary steps of surface chemical reactions and occur on the ultrafast time scale of nuclear motion. Their understanding is fundamental to the molecular level conception of chemical reaction mechanisms on surfaces, especially, for example, in catalytic materials. In this contribution a combination of an optical pump-probe configuration with time-of-flight mass spectrometry is employed to monitor in real time the mass and the relative velocity of intermediates and products of photoinduced surface reactions. Results are presented for the application of this technique to the photodissociation dynamics of methyl iodide and methyl bromide as well as to the formation dynamics of iodine, bromine and iodine monobromide molecules on magnesia ultrathin films on a Mo(100) single crystal surface. A new perspective and a further improvement of the experimental procedure will also be presented regarding the study of surface chemical reactions with femtosecond high order harmonic vacuum ultraviolet and extreme ultraviolet laser pulses by core level photoemission spectroscopy and mass spectrometry.