Accurate near-threshold model for ultracold KRb dimers from interisotope Feshbach spectroscopy

Details Accurate near-threshold model for ultracold KRb dimers from interisotope Feshbach spectroscopy Accurate near-threshold model for ultracold KRb dimers from interisotope Feshbach spectroscopy

2008-03-05

arxiv.org/abs/0803.0651v1

Physics

Condensed Matter

Other Condensed Matter

9 pages, 7 figures

Scientific paper

10.1103/PhysRevA.77.052705

We investigate magnetic Feshbach resonances in two different ultracold K-Rb mixtures. Information on the K(39)-Rb(87) isotopic pair is combined with novel and pre-existing observations of resonance patterns for K(40)-Rb(87). Interisotope resonance spectroscopy improves significantly our near-threshold model for scattering and bound-state calculations. Our analysis determines the number of bound states in singlet/triplet potentials and establishes precisely near threshold parameters for all K-Rb pairs of interest for experiments with both atoms and molecules. In addition, the model verifies the validity of the Born-Oppenheimer approximation at the present level of accuracy.

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