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MO: Molekülphysik
MO 27: Poster: Femtosecond Spectroscopy
MO 27.12: Poster
Tuesday, March 14, 2006, 16:30–18:30, Labsaal
Optimal Control of Metal Cluster Reactions by Modulated Ultra-broadband Laser Pulses — •Bruno E. Schmidt1, Denisia Popolan1,2, Sandra Lang1,2, Thorsten M. Bernhardt1,2, and Ludger Wöste1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Abteilung Oberflächenchemie und Katalyse, Universität Ulm, 89069 Ulm
During the last years the NeNePo technique was applied to study catalytic reaction properties of noble metal cluster-adsorbate complexes in a temperature controlled rf-ion trap. To further innovate this work, we not only aim to analyze the reaction dynamics, but also to steer the reactive system along one desired reaction coordinate and thus to optimize, e. g., the products of a catalytic reaction. To realize this goal, ultra-broadband laser pulses are generated by means of self phase modulation during filamentation process in noble gas atmosphere. Subsequently the broadband pulses are modulated by a liquid crystal mask and irradiated onto the cluster system. The concentration of desired reaction products is optimized in a active feedback loop employing a genetic algorithm. The experimental task is the realization of a broad spectrum which is stable enough to send it to a pulse shaper and to optimize the algorithm for this type of reaction. First results on the spectral properties of the continuum generation relying on self-guiding in noble gas will be presented and its application to the reaction control will be discussed.