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APS » Journals » Phys. Rev. A » Volume 66 » Issue 5
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Phys. Rev. A 66, 053616 (2002) [6 pages]

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

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D. M. Harber, H. J. Lewandowski, J. M. McGuirk*, and E. A. Cornell*
JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440

Received 13 August 2002; published 22 November 2002

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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.053616
DOI:
10.1103/PhysRevA.66.053616
PACS:
03.75.Fi, 05.30.Jp, 32.80.Pj, 34.20.Cf

*Also at Quantum Physics Division, National Institute of Standards and Technology.

 
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