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Phys Rev Lett. 2002 Mar 4;88(9):093201. Epub 2002 Feb 14.

Interisotope determination of ultracold rubidium interactions from three high-precision experiments.

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Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.


Combining the measured binding energies of four of the most weakly bound rovibrational levels of the 87Rb2 molecule with results of two other recent high-precision experiments, we obtain exceptionally strong constraints on the atomic interaction parameters in a highly model independent analysis. The comparison of (85)Rb and (87)Rb data, where the two isotopes are related by a mass scaling procedure, plays a crucial role. We predict scattering lengths, clock shifts, and Feshbach resonances with an unprecedented level of accuracy. Two of the Feshbach resonances occur at easily accessible magnetic fields in mixed-spin channels. One is related to a d-wave shape resonance.

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