Düsseldorf 2007 – scientific programme

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MO: Fachverband Molekülphysik

MO 25: Cold Molecules II (gemeinsam mit Q)

MO 25.3: Talk

Tuesday, March 20, 2007, 14:45–15:00, 6B

Electrostatic extraction of buffer-gas-cooled polar molecules — •Laurens D. van Buuren, Joseph Bayerl, Vincent Dugrain, Sebastian Pohle, Christian Sommer, Pepijn W.H. Pinkse, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

High-density samples of cold molecules are required to investigate their collisional and chemical properties at low temperatures. Once polar molecules can be cooled to the ultracold regime, where the dipole-dipole interaction dominates, new quantum phenomena can be studied. Cold polar molecules are also of interest for high-resolution spectroscopy, metrology, and quantum computation [1].

We present first results with a new cryogenic source delivering a dense and slow beam of internally cold molecules. The beam is produced by combining two powerful techniques. Molecules are cooled (translationally and internally) in a helium buffer gas at low temperature (T ∼ 5 K) [3]. With an electric guide slow buffer-gas-cooled molecules are filtered out of the (non-polar) helium and transported to a high-vacuum region [2], where the flux is analysed. Once the source is optimized, the cold molecules can easily be loaded into an electrostatic trap [4] for further investigations.

[1] J. Doyle et al., European Physical Journal D 31, 149 (2004)

[2] T. Junglen et al., European Physical Journal D 31, 365 (2004)

[3] S.E. Maxwell et al., Physical Review Letters 95, 173201 (2005)

[4] T. Rieger et al., Physical Review Letters 95, 173002 (2005)