Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics

MO 19.10: Poster

Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof

Centrifuge deceleration of electrically guided beams of polar molecules from a cryogenic source — •Sotir Chervenkov, Xing Wu, Andreas Rohlfes, Martin Zeppenfeld, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany

In order to obtain dense samples of internally and translationally cold polar molecules, we use the method of buffer-gas cooling [1], combined with supersonic expansion. We have demonstrated that when the cryogenic buffer-gas cell is operated in a supersonic regime, molecular fluxes are hydrodynamically enhanced by up to two orders of magnitude. Meanwhile, the translational velocity profile of the output molecular beam is cooled to beyond Mach number 6 via supersonic expansion. Due to the cryogenic cell temperature, the forward velocity of the supersonic molecular beam is about 200 m/s. The low-field-seeking molecules in the so-produced continuous supersonic beam are selected via quadrupole electric guiding [2]. Subsequent deceleration can be achieved by means of a novel technique, which employs the centrifugal potential in a rotating frame. With such a combined scheme, continuous beams of dense (several 10⁹cm⁻³), slow (below 20m/s), and internally cold polar molecules are conceivable. This technique would thus be a suitable source of polar molecules for further experiments, e.g., trapping and subsequent opto-electrical cooling [3].

[1] L.D. van Buuren et al., Phys. Rev. Lett. 102, 033001 (2009)

[2] S.A. Rangwala et al., Phys. Rev. A 67, 043406 (2003)

[3] M.Zeppenfeld et al.,Nature 491, 570 (2012)