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MO: Fachverband Molekülphysik
MO 17: Cold Molecules 3
MO 17.3: Vortrag
Donnerstag, 26. März 2015, 11:45–12:00, PH/HS1
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 to mixed-field orient them using laser pulses in combination with strong electric fields. These are important methods for molecular-frame imaging of molecular dynamics [1, 2]. For the state selection we developed a Stark deflector with a so-called b-type shape. Simulations of the new design predict a much stronger deflection and better state separation then previous Stark deflectors. In mixed-field orientation a strong static electrical field avoids nonadiabatic effects [3]. Therefore, we extended the idea of a two plate velocity map imaging spectrometer [4] to allow for strong electric fields up to 27 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] Holmegaard et al., Nat. Phys. 6, 428 (2010)
[2] Küpper et al., Phys. Rev. Lett. 112, 083002 (2014)
[3] Nielsen et al., Phys. Rev. Lett. 108, 193001 (2012)
[4] Papadakis and Kitsopoulos, Rev. Sci. Instr. 77, 083101 (2006)