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APS » Journals » Phys. Rev. A » Volume 67 » Issue 6
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Phys. Rev. A 67, 060701(R) (2003) [4 pages]

Very-high-precision bound-state spectroscopy near a 85Rb Feshbach resonance

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N. R. Claussen, S. J. J. M. F. Kokkelmans*, S. T. Thompson, E. A. Donley, E. Hodby, and C. E. Wieman
JILA, National Institute of Standards and Technology, University of Colorado, Colorado 80309-0440, USA
Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

Received 20 January 2003; published 20 June 2003

We precisely measured the binding energy (εbind) of a molecular state near the Feshbach resonance in a 85Rb Bose-Einstein condensate (BEC). Rapid magnetic-field pulses induced coherent atom-molecule oscillations in the BEC. We measured the oscillation frequency as a function of B field and fit the data to a coupled-channel model. Our analysis constrained the Feshbach resonance position [155.041(18) G], width [10.71(2) G], and background scattering length [-443(3)a0] and yielded new values for the Rb interaction parameters. These results improved our estimate for the stability condition of an attractive BEC. We also found evidence for a mean-field shift to εbind.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.060701
DOI:
10.1103/PhysRevA.67.060701
PACS:
34.20.Cf, 03.75.Nt

*Present address: Laboratoire Kastler Brossel, ENS, 24 rue Lhomond, 75005 Paris, France.

 
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