München 2004 – wissenschaftliches Programm

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MO: Molekülphysik

MO 17: Poster II

MO 17.1: Poster

Donnerstag, 25. März 2004, 14:00–16:00, Schellingstr. 3

Towards trapping of slow, polar molecules from an effusive source — •T. Rieger, T. Junglen, S.A. Rangwala, P.W.H. Pinkse, and G. Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching.

The ability to trap cold molecules should facilitate the study of ultracold molecular physics and of ultracold collisions in particular. In the last few years significant steps towards this goal have been made [1].

Recently, we have successfully produced a beam of slow polar molecules with a new filtering technique [2]. In that experiment, molecules from a room-temperature effusive source are injected into a bent electrostatic quadrupole guide, which acts as a longitudinal and transversal velocity filter for molecules in a low-field-seeking Stark state. The effusive source is now pre-cooled to temperatures below the melting point of the polar molecule (ND₃) that is being used. Here we report on these and other improvements in the design, which increased the flux of slow molecules and improved the vacuum in the detection chamber. We plan to use this improved source to continuously load an electrostatic trap, for which it is vital to have velocities smaller than about 10 m/s.

[1] D. Egorov et al., Phys. Rev. A 66, 043401 (2002); H.J. Loesch et al., Phys. Rev. Lett. 85, 2709 (2000); H.L. Bethlem et al., Phys. Rev. Lett. 88, 13003 (2002)

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