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

, , , and . Physical Review A, 66 (5): 053616+ (Nov 22, 2002)
DOI: 10.1103/physreva.66.053616

Abstract

We have performed precision microwave spectroscopy on ultracold 87Rb confined in a magnetic trap, both above and below the Bose-condensation transition. The cold collision frequency shifts for both normal and condensed clouds were measured, which allowed the intrastate and interstate density correlations (characterized by sometimes controversial ” factors of 2”) 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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