Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 6: Poster: Cold Molecules
MO 6.8: Poster
Montag, 14. März 2011, 16:00–18:00, P1
Stark decelerated SO2 for dissociation and collision studies — •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.
The photodissociation experiments on the SO2 molecule accomplished close to the nozzle, have confirmed the energetical position of the threshold of the state C̃1B2 for dissociating to SO(X3Σ−, v=1) + O(3P)[2]. Based on this, the experiments on photodissociation of the SO2 molecule guided through the decelerator are underway. The predissociation at the threshold of decelerated SO2 molecules, prepared in a state selective excitation by a frequency-doubled dye laser, results in the production of cold O in its ground state and cold SO fragments in few rotational levels of selected vibrational states in its lowest electronic state [3]. The detection of the molecular fragment SO by means of the (1+1) REMPI technique using a second frequency-doubled dye laser will enable measuring the velocity distribution of the both photofragments, SO and O.
[1] O. Bucicov, Eur. Phys. J. D 46 463 (2008).
[2] C. Braatz, E. Tiemann, Chem. Phys. 229 93 (1998).
[3] S. Jung, J. Phys. B 39 S1085 (2006).