We present an Asymptotic Bound state Model (ABM), which is useful to predict Feshbach resonances. The model utilizes asymptotic properties of the interaction potentials to represent coupled molecular wavefunctions. The bound states of this system give rise to Feshbach resonances, localized at the magnetic fields of intersection of these bound states with the scattering threshold. This model was very successful to assign measured Feshbach resonances in an ultra cold mixture of ^6Li and ^40K atomsootnotetextE. Wille, F.M. Spiegelhalder, G. Kerner, D. Naik, A. Trenkwalder, G. Hendl, F. Schreck, R. Grimm, T.G. Tiecke, J.T.M. Walraven, S.J.J.M.F. Kokkelmans, E. Tiesinga, P.S. Julienne, arXiv:0711.2916. For this system, the accuracy of the determined scattering lengths is comparable to full coupled channels results. However, it was not possible to predict the width of the resonances. We discuss how an incorporation of threshold effects will improve the model, and we apply it to a mixture of ^87Rb and ^133Cs atoms, where recently Feshbach resonances have been measured.
|Publication status||Published - 1 May 2008|
|Event||39th Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics, DAMOP 2008 - Nittany Lion Inn, Penn State University, State College, United States|
Duration: 27 May 2008 → 31 May 2008
Conference number: 39
|Conference||39th Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics, DAMOP 2008|
|Abbreviated title||DAMOP 2008|
|Period||27/05/08 → 31/05/08|