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Bulletin of the American Physical Society

Resolved-sideband RF spectroscopy on weakly bound $^6$Li$_2$ molecules

Selim Jochim, G. Z urn, A. N. Wenz, Thomas Lompe, Paul S. Julienne, Jeremy M. Hutson

Published Jun 5, 2012• 0 citations
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Resolved-sideband RF spectroscopy on weakly bound 6^66Li2_22​ molecules
Weakly Bound Li He 2_\mathbf{2 }2​ 2 Molecules
Single and two photon spectroscopy of ultracold dipolar 6^{\mathrm{6}}6Li-40^{\mathrm{40}}40K molecules
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We perform radio-frequency dissociation spectroscopy of weakly bound 6Li2 Feshbach molecules using low-density samples of about 30 molecules in an optical dipole trap. Combined with a high magnetic field stability, this allows us to resolve the discrete trap levels in the radio-frequency dissociation spectra. This novel technique allows the binding energy of Feshbach molecules to be determined with unprecedented precision. We use these measurements as an input for a fit to the 6Li scattering potential using coupled-channel calculations. From this new potential, we determine the pole positions of the broad 6Li Feshbach resonances with an accuracy better than 7×10(-4) of the resonance widths. This eliminates the dominant uncertainty for current precision measurements of the equation of state of strongly interacting Fermi gases. As an important consequence, our results imply a corrected value for the Bertsch parameter ξ measured by Ku et al. [Science 335, 563 (2012)], which is ξ=0.370(5)(8).
We create weakly bound Feshbach molecules in ultracold Fermi gas 4~K by sweeping a magnetic field across a broad Feshbach resonance point 202.2 G with a rate of 20 ms/G and perform the dissociation process using radio-frequency （RF） technology. From RF spectroscopy, we obtain the binding energy of the weakly bound molecules in the vicinity of Feshbach resonance. Our measurement also shows that the number of atoms generated from the dissociation process is different at various magnetic fields with the same RF amplitude, which gives us a deeper understanding of weakly bound Feshbach molecules.