Precise Determination of $^{6}\mathrm{Li}$ Cold Collision Parameters by Radio-Frequency Spectroscopy on Weakly Bound Molecules

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

M. Bartenstein, A. Altmeyer, S. Riedl, R. Geursen, S. Jochim, C. Chin, J. Hecker Denschlag, R. Grimm, A. Simoni, E. Tiesinga, C. J. Williams, and P. S. Julienne

Phys. Rev. Lett. 94, 103201 – Published 18 March 2005

Abstract

We employ radio-frequency spectroscopy on weakly bound ${}^{6}{Li}_{2}$ 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 ${}^{6}{Li}$ atoms based on a multichannel quantum scattering model. We determine the singlet and triplet scattering lengths to be $a_{s} = 45.167 (8) a_{0}$ and $a_{t} = - 2140 (18) a_{0}$ ( $1 a_{0} = 0.052 917 7 nm$ ), 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.

Received 28 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.103201

Authors & Affiliations

M. Bartenstein¹, A. Altmeyer¹, S. Riedl¹, R. Geursen¹, S. Jochim¹, C. Chin^1,*, J. Hecker Denschlag¹, and R. Grimm^1,2

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

^*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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Vol. 94, Iss. 10 — 18 March 2005

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Physical Review Letters

Precise Determination of Li6 Cold Collision Parameters by Radio-Frequency Spectroscopy on Weakly Bound Molecules

M. Bartenstein, A. Altmeyer, S. Riedl, R. Geursen, S. Jochim, C. Chin, J. Hecker Denschlag, R. Grimm, A. Simoni, E. Tiesinga, C. J. Williams, and P. S. Julienne

Phys. Rev. Lett. 94, 103201 – Published 18 March 2005

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