Hannover 2010 – wissenschaftliches Programm
MO 28.7: Poster
Donnerstag, 11. März 2010, 16:00–18:30, Lichthof
Continuous guided beams of slow and internally cold polar molecules — Christian Sommer1, •Laurens D. van Buuren1, Michael Motsch1, Sebastian Pohle1, Joseph Bayerl1, Pepijn W.H. Pinkse1,2, and Gerhard Rempe1 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 2Mesa+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
In the last years we have developed a source which produces high-flux beams of electrically guided cold molecules. A molecular gas is cooled by collisions with a cryogenic buffer gas, after which an electric quadrupole guide selects slow molecules in low-field-seeking states and transports them out of the cryogenic environment. For formaldehyde we have demonstrated the high state-purity in the extracted beam by a laser-depletion experiment . As an alternative to the laser-depletion technique, we have qualitatively confirmed internal cooling for other species as well, from time-of-flight measurements obtained at different buffer-gas settings. Here, we review the source, including its technical aspects and optimization, and present its versatility from results obtained with different molecules .
 L.D. van Buuren et al., Phys. Rev. Lett. 102, 033001 (2009)
 C. Sommer et al., Faraday Discussions 142, 203 (2009)