Precise determination of ⁶Li cold collision parameters by radio-frequency spectroscopy on weakly bound molecules

2004/08/31 by M. Bartenstein, A. Altmeyer, S. Riedl +9 · 1 citation
Physics and Astronomy · #cond-mat.other

paper · pdf · doi:10.1103/physrevlett.94.103201

published as Phys. Rev. Lett. 94, 103201 (2005)

arxiv created 2004/08/31 · arxiv updated 2009/12/01

Abstract

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 multi-channel quantum scattering model. We determine the singlet and triplet scattering lengths to be a_s=45.167(8)a₀ and a_t=-2140(18)a₀ (1 a₀ = 0.0529177 nm), and the positions of the broad Feshbach resonances in the energetically lowest three s-wave scattering channels to be 83.41(15) mT, 69.04(5) mT, and 81.12(10) mT.

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