Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 49: Ultrakurze Laserpulse (Anwendungen II)

Q 49.9: Talk

Thursday, March 13, 2008, 18:30–18:45, 3H

Strong field control of molecular dynamics by resonant shaped ultrashort laser pulses — •Matthias Wollenhaupt, Tim Bayer, and Thomas Baumert — Universität Kassel, Institut für Physik and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

Quantum control by tailored ultrashort light pulses is very successful to manipulate physical and chemical properties of matter. In many cases the underlying physical processes are not very well understood – particularly when shaped resonant intense pulses are applied. These pulses are of general importance because resonant control scenarios are the dominant pathways for pulses with ultra broad spectra. In this contribution the physical mechanism of strong field quantum control using tailored resonant pulses is investigated on small molecules [1-3]. Switching among different final electronic states is realized by selective population of dressed states (SPODS). Our experiment is based on femtosecond pulse shaping and time-of-flight photoelectron spectroscopy. The spectrum of a femtosecond laser pulse is sinusoidally phase-modulated in frequency domain [4] to produce a sequence of pulses interacting with molecules in a beam. Our result show selectivity among different electronic states. Because SPODS is ultrafast our strategy might be operative in the presence of decoherence processes as well. [1] M. Wollenhaupt et al., Chem. Phys. Lett 419, 184 (2006)   [2] M. Wollenhaupt and T. Baumert, J. Photochem. Photobiol. A 180, 248 (2006)   [3] M. Wollenhaupt et al., Ann. Rev. Phys. Chem. 56, 25 (2005)   [4] M. Wollenhaupt et al., Phys. Rev. A. 73, 063409 (2006)