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MO: Molekülphysik
MO 21: Ultrakurze Lichtimpulse: Quantenkontrolle (gemeinsame Sitzung mit Fachverband Q)
MO 21.5: Talk
Friday, March 26, 2004, 12:00–12:15, HS 223
Controlling Isotope Ratio Ionization with Shaped fs-Laser Pulses — •Cosmin Lupulescu, Albrecht Lindinger, Mateusz Plewicki, Stefan M. Weber, Andrea Merli, Franziska Vetter , and Ludger Wöste — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin
Isotope selection is an issue of high interest in many fields of science. We report the control of the isotope ratio ionization R = 39,39K2+/39,41K2+ by means of shaped laser pulses. This is achieved by combining pulse shaping techniques with evolutionary algorithms. The isotope ratio could be maximized up to R = 72 or minimized to R = 0.5. Information about the dynamics occurring on the optimal ionization path is gained from the optimal laser fields. The applied optimization method and the results obtained for phase and/or amplitude modulated pulses at different wavelengths will be discussed. The experiment demonstrates the general feasibility of the optimization method for all isotopic molecules.