Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Poster 1: Cold Molecules, Femtosecond Spectroscopy, Molecular Dynamics

MO 13.2: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.IV

A centrifuge decelerator for supersonic beams of buffer-gas cooled polar molecules — •Andreas Rohlfes, Xing Wu, Christian Sommer, Sotir Chervenkov, Martin Zeppenfeld, Laurens van Buuren, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany

We present a novel and versatile scheme for the production of quasi continuous beams of slow and internally cold polar molecules. We produce internally cold polar molecules by a supersonic expansion from a cryogenic buffer-gas cell, which results in the formation of a continuous and hydrodynamically enhanced beam of longitudinally fast molecules with a narrow velocity distribution. Further, these beams are accepted and guided by a quadrupole electric guide [1] to a centrifuge decelerator. The latter employs the centrifugal potential in a rotating frame to slow down the molecules when they are guided from the periphery to the center. With this deceleration scheme quasi continuous beams of internally cold and slow molecules with longitudinal velocities below 20m/s can be produced. Thus this technique is a suitable source of polar molecules for further experiments, e.g., trapping and subsequent opto-electrical cooling[2].

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

[2] M.Zeppenfeld et al.,Phys. Rev. A. 80,041401(R) (2009)