Efficient creation of molecules from a cesium Bose-Einstein condensateM. Mark1, T. Kraemer1, J. Herbig1, C. Chin1, H.-C. Nägerl1 and R. Grimm1, 2
1 Institut für Experimentalphysik, Universität Innsbruck Technikerstraße 25, 6020 Innsbruck, Austria
2 Institut für Quantenoptik und Quanteninformation Österreichische Akademie der Wissenschaften - 6020 Innsbruck, Austria
received 29 September 2004; accepted in final form 12 January 2005
published online 2 February 2005
We report a new scheme to create weakly bound molecules from an atomic Bose-Einstein condensate. The method is based on switching the magnetic field to a narrow Feshbach resonance and yields a high atom-molecule conversion efficiency of more than 30%, a factor of three higher than obtained with conventional magnetic-field ramps. The molecules are created in a single g-wave rotational quantum state. The observed dependence of the conversion efficiency on the magnetic field and atom density shows scattering processes beyond two-body coupling to occur in the vicinity of the Feshbach resonance.
03.75.-b - Matter waves.
34.50.-s - Scattering of atoms and molecules.
32.80.Pj - Optical cooling of atoms; trapping.
© EDP Sciences 2005