Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Poster: Femtosecond Spectroscopy
MO 7.6: Poster
Dienstag, 9. März 2010, 16:00–18:30, Lichthof
Pump-probe experiments on H2 ultrashort carrier-envelope phase stabilized laser pulses — •Vandana Sharma1, Bettina Fischer1, Manuel Kremer1, Bernold Feuerstein1, Thomas Pfeifer1, Uwe Thumm2, Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2James R. Macdonald Laboratory, Kansas State University, Manhattan, Kansas 66506-2606, USA
The ability to control electron localization in H2 dissociating due to bond-softening by carrier-envelope phase stabilized ultrashort laser pulses was recently demonstrated experimentally [1]. In order to gain more control and more insight into the localization mechanism, the measurements were extended to two laser pulses.
By the first pulse the neutral H2 molecule is singly ionized and a wave packet is created in H2+. Electron localization is achieved via a second laser pulse at a variable time delay after the first one. Studying the delay-dependent electron localization in the revival of the wave packet allows one to gain insight into the influence of the wave packet dynamics. By a comparison of the revival with the dephasing region the influence of coherence is analyzed.
Measurements on the delay-dependent proton emission asymmetry in the revival and the dephasing region are presented. Comparing the data to wave packet simulations allows to attribute the structure of the asymmetry to the properties of the wave packet.
Manuel Kremer et al., Phys. Rev. Lett. 103, 213003 (2009)