Darmstadt 2008 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 24: Kalte Moleküle

MO 24.3: Poster

Donnerstag, 13. März 2008, 16:30–19:00, Poster C1

Stark deceleration of SO₂ — •Oleg Bucicov¹, Eberhard Tiemann¹, and Christian Lisdat² — ¹Institut 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.

This offers the possibility of studying the predissociation of the trapped cold SO₂ at the threshold resulting in the production of cold SO molecules and O atoms. We will measure the velocity distribution of the photofragments. The previous research showed that the dissociation process can be manipulated by an external electric field that shifts the dissociation asymptotes relative to the predissociating levels [2]. In this way the reaction channels can be opened or closed at will or the tuning of the velocity of fragments can be attained, these opportunities being very attractive for the field of cold molecules and cold chemistry.

[1] O. Bucicov et al., submitted to EPJD.

[2] S. Jung et al., J. Phys. B 39, S1085, 2006.