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Comptes Rendus de l Académie des Sciences - Series IV - Physics-Astrophysics

Determination of Cs–Cs interaction parameters using Feshbach spectroscopy

Andrew J. Kerman, Cheng Chin, Vladan Vuletić, Steven Chu, Paul J. Leo, Carl J. Williams, Paul S. Julienne

Published Jun 1, 2001• 12 citations
Publisher
DOI
10.1016/s1296-2147(01)01196-9

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Abstract : We measure high-resolution Feshbach resonance spectra for ultracold desium atoms colliding in different hyperfine and magnetic sublevels. More than 25 Feshback resonances are observed for magnetic fields below 230 G in the elastic and inelastic ground state collision cross sections, as well as in the cross section for light-assisted collisions. From thes spectra a consistent set of ground state molecular interaction parameters for desium is extracted, including singlet and triplet scattering lengths of As=(280 +/- 10)a) and At=(2400 +/- 100)a), a van der Waals coefficient C6=(6890 +/- 35) a.u., as well as the strength of the indirect spin-spin coupling. This set of parameters allows for the first time a complet characterisation of cesium's ultra-cold collision properties.
We investigate magnetically tunable Feshbach resonances in ultracold collisions between ground-state Yb and Cs atoms, using coupled-channel calculations based on an interaction potential recently determined from photoassociation spectroscopy. We predict resonance positions and widths for all stable isotopes of Yb, together with resonance decay parameters where appropriate. The resonance patterns are richer and more complicated for fermionic Yb than for spin-zero isotopes, because there are additional level splittings and couplings due to scalar and tensorial Yb hyperfine interactions. We examine collisions involving Cs atoms in a variety of hyperfine states and identify resonances that appear most promising for experimental observation and for magnetoassociation to form ultracold CsYb molecules.