Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 20: Experimental Techniques I
MO 20.4: Vortrag
Donnerstag, 11. März 2010, 11:45–12:00, F 142
Photoelectron distributions of fixed-in-space molecules — Lotte Holmegaard1, Jonas L. Hansen1, Line Kalhøj1, Sofie Louise Kragh1, Henrik Stapelfeldt1, Frank Filsinger2, •Jochen Küpper2, Gerard Meijer2, Darko Dimitrovski1, Mahmoud Abu-samha1, Christian P. J. Martiny1, and Lars Bojer Madsen1 — 1University of Aarhus, Denmark — 2Fritz-Haber-Institut der MPG, Berlin
Currently, many novel investigations, such as ultrafast X-ray or electron diffraction, aim at providing structural and dynamical information directly from the molecular frame. In order to experimentally obtain such data from molecular ensembles, one has to rigidly connect the laboratory and molecular frames. Over the last years, we have developed the necessary techniques to perform such experiments: We have demonstrated the quantum-state and conformer-selection of large molecules using inhomogeneous electric fields. We have successively demonstrated unprecedented degrees of laser alignment and mixed (dc-electric and laser) field orientation of these samples, rigidly linking molecular and laboratory frame. We have now exploited these state-selected and oriented samples to measure photoelectron angular distributions in the molecular frame (MFPADs) from non-resonant femtosecond-laser photoionization. The obtained MFPADs show rich structure which provide information about the charge distribution and electrical properties of the molecule. Moreover, these MFPADs could provide detailed information on ultrafast molecular dynamics in future pump-probe experiments.