Düsseldorf 2007 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 29: Poster: Cold Molecules

MO 29.5: Poster

Dienstag, 20. März 2007, 16:30–18:30, Poster A

Trapping and cooling of single molecular ions for time resolved electron diffraction — •Günther Leschhorn, Steffen Kahra, Axel Friedenauer, Hector Schmitz, Ernst Fill, and Tobias Schätz — Max-Planck-Institut für Quantenoptik, Garching

We propose an experimental setup for the preparation of single, cold and localized molecular ions using a linear Paul-trap. The ions are cooled sympathetically by a Mg⁺ or Ba⁺-Coulomb crystal stored in the trap. We present a technique to achieve a reliable positioning of the molecular ions after separating them from the crystal at repetition rates on the order of 1 kHz or higher. The reloading scheme operates on axis of the linear Paul-trap and bases on dissipative interaction between the crystal and the molecular ions. This provides us with a source for cold and located charged molecules as targets for time resolved electron diffraction. Our electron gun should emit short electron bunches using recent developments of short and intense laser facilities. It is expected that the diffracted electrons will provide us with information about synchronized and photo triggered structural changes of molecules on a short timescale. Further developments such as the alignment of the molecular ion by fs-laser pulses, internal cooling and the generation of even shorter electron pulses or implementing X-ray pulses should considerably increase the efficiency and suitability of the apparatus and can be discussed.
Supported by: IMPRS, MAP, MPG