Hamburg 2009 – scientific programme
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MO: Fachverband Molekülphysik
MO 11: Kalte Moleküle 2
MO 11.4: Talk
Tuesday, March 3, 2009, 14:45–15:00, VMP 6 HS-G
Electrostatic Extraction of Molecules from a Cryogenic Buffer Gas — •Christian Sommer, Laurens D. Van Buuren, Michael Motsch, Sebastian Pohle, Josef Bayerl, Pepijn W.H. Pinkse, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
We report a new method to produce a high flux, electrically guided beam of cold and slow polar molecules based on buffer-gas cooling and electrostatic velocity filtering. In our setup room-temperature molecules are injected into a cryogenic helium buffer gas. By collisions with the helium, the external and internal degrees of freedom of the molecules are cooled. A fraction of the cold molecules is extracted by an electrostatic quadrupole guide and transported to a high-vacuum region. There, the molecules are detected by a residual gas analyzer, to determine the flux as well as the velocity distribution of the guided molecules [1]. The internal state population is monitored by depletion spectroscopy [2]. For H2CO, we find more than 80 % of the guided molecules in a single rovibrational state [3].
[1] C. Sommer et al., arXiv:0812.1923 (2008)
[2] M. Motsch et al., Phys. Rev. A 76, 61402(R) (2007)
[3] L.D. Van Buuren et al., arXiv:0806.2523 (2008)