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Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 28: Poster: Cold Molecules

MO 28.6: Poster

Donnerstag, 11. März 2010, 16:00–18:30, Lichthof

Stark decelerated SO2 for dissociation and collision studies — •Oleg Bucicov1, Eberhard Tiemann1, and Christian Lisdat21Institut für Quantenoptik, Leibniz Universität Hannover — 2Physikalisch-Technische Bundesanstalt, Braunschweig

We present a Stark decelerator for low-field-seeking states with 326 stages, with which we succeeded in decelerating SO2 molecules to the velocity of about 50 m/s [1]. With this decelerator it should be possible to bring the relatively heavy SO2 molecules to a standstill and to trap them electrostatically.

The preliminary experiments with Xe atom ionization and detection and the two-photon dissociation of SO2 molecules with subsequent single photon ionization of the electronically excited SO photofragment have demostrated that our developed data acquisition system is capable of detection down to the limit of single ions.

The predissociation at the threshold of cold decelerated SO2 molecules, prepared in the first state selective excitation step using a frequency-doubled dye laser, would result in the production of cold fragments: O in its ground state and SO in few rotational levels of selected vibrational states in the lowest electronic state [2]. The detection of the molecular fragment SO by means of the (1+1) REMPI technique using a second frequency-doubled dye laser would enable measuring the velocity distribution of the both photofragments SO and O.

[1] O. Bucicov, Eur. Phys. J. D 46 463 (2008).

[2] S. Jung, J. Phys. B 39 S1085 (2006).

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