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Berlin 2001 – wissenschaftliches Programm

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Q: Quantenoptik

Q 17: Poster: Cooling and Trapping

Q 17.25: Poster

Mittwoch, 4. April 2001, 12:30–15:00, AT2

Experiments with a matter wave interferometer towards the examination of collisions between atoms and molecules — •Christian Lisdat, Matthias Frank, Chandra Joshi, Horst Knöckel, and Eberhard Tiemann — SFB 407, Institut für Quantenoptik, Universität Hannover

In the presence of collisions, the phase of a propagating matter wave is changed. This effect can be monitored by a wave interferometer, which compares the phases of two matter wave packets, which where affected in different ways by those collisions [1].
The relative velocities of the collision partners will be in the order of 20 m/s, if a seeded supersonic beam is applied, corresponding to temperatures about 1 K.
We present first experimental results obtained with our Ramsey-Bordé interferometer for K2 molecules, that indicate influences of collisions between K2 and potassium atoms within the beam on the interference signal. The potassium atoms are prepared in different excited levels.
The present experimental status is shown and the numerical analysis of the recorded interference structures is described. The effects of collisions on the interference pattern are discussed as well as an interpretation of the experimental results.

[1] J. Schmiedmayer, M. Chapman, C. Ekstrom, T. Hammond, S. Wehinger, and D. Pritchard, Phys. Rev. Lett. 74, (1995) 1043

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DPG-Physik > DPG-Verhandlungen > 2001 > Berlin