Document Type

Article

Publication Date

Summer 6-20-2003

Publication Title

Physical Review A

ISSN

1050-2947

Volume

67

Issue

6

First Page

060701-1

Last Page

060701-4

DOI

10.1103/PhysRevA.67.060701

Abstract

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.

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