Effect of cold collisions on spin coherence and resonance shifts in a magnetically trapped ultra-cold gas

Details Effect of cold collisions on spin coherence and resonance shifts in a magnetically trapped ultra-cold gas Effect of cold collisions on spin coherence and resonance shifts in a magnetically trapped ultra-cold gas

2002-08-15

arxiv.org/abs/cond-mat/0208294v2

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 5 figures; reference added and minor changes

Scientific paper

10.1103/PhysRevA.66.053616

We have performed precision microwave spectroscopy on ultra-cold Rb-87 confined in a magnetic trap, both above and below the Bose-condensation transition. The cold collision shifts for both normal and condensed clouds were measured, which allowed the intra- and inter-state density correlations (characterized by sometimes controversial "factors of two") to be determined. Additionally, temporal coherence of the normal cloud was studied, and the importance of mean-field and velocity-changing collisions in preserving coherence is discussed.

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