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Phys. Rev. Lett. 94, 103201 (2005) [4 pages]

Precise Determination of 6Li Cold Collision Parameters by Radio-Frequency Spectroscopy on Weakly Bound Molecules

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M. Bartenstein1, A. Altmeyer1, S. Riedl1, R. Geursen1, S. Jochim1, C. Chin1,*, J. Hecker Denschlag1, and R. Grimm1,2
1Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria

A. Simoni†, E. Tiesinga, C. J. Williams, and P. S. Julienne
Atomic Physics Division, National Institute of Standards and Technology, 100 Bureau Drive Stop 8423, Gaithersburg, Maryland 20899, USA

Received 28 August 2004; published 18 March 2005

We employ radio-frequency spectroscopy on weakly bound 6Li2 molecules to precisely determine the molecular binding energies and the energy splittings between molecular states for different magnetic fields. These measurements allow us to extract the interaction parameters of ultracold 6Li atoms based on a multichannel quantum scattering model. We determine the singlet and triplet scattering lengths to be as=45.167(8)a0 and at=-2140(18)a0 (1a0=0.052 917 7  nm), and the positions of the broad Feshbach resonances in the energetically lowest three s-wave scattering channels to be 83.41(15), 69.04(5), and 81.12(10) mT.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.103201
DOI:
10.1103/PhysRevLett.94.103201
PACS:
34.50.–s, 05.30.Jp, 32.80.Pj, 67.40.Hf

*Present address: Department of Physics and the James Franck Institute, University of Chicago, Chicago, IL 60637, USA.

†Present address: UMR 6627 du CNRS, Lab. de Physique des Atomes, Lasers, Molécules et Surfaces, Université de Rennes, France.

 
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