Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Femtosecond Spectroscopy II
MO 14.5: Vortrag
Mittwoch, 10. März 2010, 15:15–15:30, F 102
Electron Localization in Fragmentation of H2 with CEP Stabilized Laser Pulses — •Manuel Kremer1, Bettina Fischer1, Bernold Feuerstein1, Vitor L. B. de Jesus2, Vandana Sharma1, Christian Hofrichter1, Artem Rudenko3, Uwe Thumm4, Claus Dieter Schröter1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro (IFRJ), Nilópolis, RJ, Brazil — 3Max-Planck Advanced Study Group at CFEL, D-22607 Hamburg, Germany — 4James R. Macdonald Laboratory, Kansas State University, Manhattan, Kansas 66506-2606, USA
Fully differential data for H2 dissociation in ultrashort (6 fs, 760 nm), linearly polarized, intense
(0.44 PW/cm2) laser pulses with a stabilized carrier-envelope phase (CEP) were recorded with a reaction
microscope. Depending on the CEP, the molecular orientation, and the kinetic energy release (KER), we see a clear asymmetry in the proton emission for kinetic energy releases between 0−3 eV as basically predicted by Roudnev and Esry [1] and much stronger than in earlier measurements by Kling et al. [2]. Wave packet propagation simulations were
carried out, which reproduce the salient features and together with the KER-independent electron asymmetry observed in the experiment, rule out the first ionization step to be the reason for the asymmetric proton emission.
V. Roudnev and B.D. Esry, Phys. Rev. A 76, 0234033 (2007).
M. F. Kling et al., Science 312, 246 (2006).