Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 17: Experimental Techniques
MO 17.7: Vortrag
Freitag, 10. März 2017, 12:45–13:00, N 6
Time-dependent analysis of the mixed-field orientation of molecules without rotational symmetry — •Linda V. Thesing1, Rosario González-Férez2, and Jochen Küpper1,3,4 — 1Center for Free-Electron Laser Science, DESY — 2Instituto Carlos I, Universidad de Granada — 3The Hamburg Center for Ultrafast Imaging, University of Hamburg — 4Department of Physics, University of Hamburg
We present a time-dependent study of the rotational dynamics of molecules without rotational symmetry and compute the 1D and 3D orientation in combined ac and dc electric fields. For a weak dc field, our results for the 1D orientation of a thermal ensemble of 6-chloropyridazine-3-carbonitrile (CPC) molecules are in good agreement with experimental observations for a state selected sample [1]. For an elliptically polarized laser, our theoretical results additionally show that the molecules are 3D oriented. If the dc field strength is increased, the 3D orientation is enhanced for certain angles between the ac and dc fields. Analyzing the field-dressed dynamics as the laser is turned on, we find highly non-adiabatic effects due to the complex energy level structure of the CPC molecule, and investigate their impact on the mixed-field orientation.
[1] Hansen et al., J. Chem. Phys. 139, 234313 (2013)