Observation of interspecies Feshbach resonances in an ultracold 39K-133Cs mixture and refinement of interaction potentials.

  title={Observation of interspecies Feshbach resonances in an ultracold 39K-133Cs mixture and refinement of interaction potentials.},
  author={Michael Grobner and Philipp Weinmann and Emil Kirilov and H. C. Nagerl and Paul S. Julienne and C. Ruth Le Sueur and Jeremy M. Hutson},
  journal={Physical Review A},
We observe interspecies Feshbach resonances due to s-wave bound states in ultracold 39K -133Cs scattering for three different spin mixtures. The resonances are observed as joint atom loss and heating of the K sample. We perform least-squares fits to obtain improved K-Cs interaction potentials that reproduce the observed resonances, and carry out coupled-channel calculations to characterize the scattering and bound-state properties for 39K-Cs, 40K-Cs, and 41K-Cs. Our results open up the… 

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