Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 6: Poster Ultrakalte Moleküle
Q 6.2: Poster
Freitag, 4. März 2005, 11:00–12:30, Poster HU
Tuning a Feshbach resonance through a shape resonance in the dissociation of ultracold molecules — •Niels Syassen1, Thomas Volz1, Stephan Dürr1, Gerhard Rempe1, Eric van Kempen2, and Servaas Kokkelmans2 — 1Max-Planck-Institut für Quantenoptik, P.O. Box 1327, 85741 Garching, Germany — 2Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands
We study the dissociation of ultracold molecules made from an atomic 87Rb Bose-Einstein condensate using a Feshbach resonance. For the resonance investigated here, the atoms form a bound state with angular momentum quantum number l=2, a d-wave molecule. When these molecules are dissociated by jumping the magnetic field across the Feshbach resonance, the s and d partial waves of unbound atoms are populated leading to a spatial interference pattern. The d-wave decay-channel exhibits a shape resonance caused by a quasi-bound state behind the centrifugal barrier. This shape resonance is studied by magnetically tuning the Feshbach resonance through it [1]. The relative phase between the partial waves, the branching ratio, and the total decay rate show a clear signature of the shape resonance. For the first time, we capture the physics of the shape resonance in a dissociation experiment instead of a scattering experiment. A theory which connects scattering and decay is developed and agrees well with the experiment.
[1] T. Volz et al., cond-mat/0410083