Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 27: Ultracold collisions (jointly with Q)

A 27.5: Vortrag

Freitag, 23. März 2007, 11:45–12:00, 6G

Interacting Rubidium and Caesium Atoms — •Claudia Weber, Michael Haas, Shincy John, Vanessa Leung, Lars Steffens, Daniel Frese, Dietmar Haubrich, Arno Rauschenbeutel, and Dieter Meschede — Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115 Bonn

In our experimental set up we simultaneously store Rubidium and Caesium in a magnetic trap. We use species-selective microwave cooling on the Rubidium groundstate hyperfine transition. Caesium is sympathetically cooled via elastic collisions with Rubidium. We are thus able to cool down the mixture to temperatures below 1 µK. Below 4 µK we observe strong losses of Caesium.
Analysing the dynamics of sympathetic cooling we are able to estimate a lower limit for the Rubidium-Caesium s-wave scattering length.