Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets
MO 19.29: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
Optimized Stark deflection and mixed-field orientation of OCS molecules — Jens S. Kienitz1,2, Sebastian Trippel1, Karol Długołecki1, Rosario González-Férez2,3, and •Jochen Küpper1,2,4 — 1Center for Free-Electron Laser Science, DESY — 2Center for Ultrafast Imaging, University of Hamburg — 3Instituto Carlos I, Universidad de Granada — 4Department of Physics, University of Hamburg
We demonstrate the use of very strong static electric fields to improve the well-known techniques to state-select molecules in the electric deflector and for mixed-field orientation [1]. These are important methods to provide ideal samples for molecular-frame imaging of molecular dynamics in the gas phase [2]. For the state selection we developed a Stark deflector with a two-rod geometry, similar to [3]. Experimental results confirm a stronger deflection and better state separation then previous stark deflectors. In mixed-field orientation a strong static electric field avoids nonadiabatic effects [4]. Therefore, we extended the idea of a two plate velocity map imaging spectrometer [5] to allow for strong electric fields up to 22 kV/cm. We will present its use in alignment and orientation experiments and disentangle the rotational motion of molecules in combined strong electric fields and laser pulses.
[1] Chang et al., Int. Rev. Phys. Chem. 34, 557 (2015)
[2] Holmegaard et al., Nat. Phys. 6, 428 (2010)
[3] Stefanov et al., Meas. Sci. Technol. 19, 055801 (2008)
[4] Nielsen et al., Phys. Rev. Lett. 108, 193001 (2012)
[5] Papadakis and Kitsopoulos, Rev. Sci. Instr. 77, 083101 (2006)