Properties of cold collisions of 39K atoms and of 41K atoms in relation to Bose-Einstein condensation

H.M.J.M. Boesten, J.G.C. Tempelaars, B.J. Verhaar

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    Abstract

    We have determined properties of cold 39K+39K and 41K+41K collisions by a multichannel inverted perturbation approach applied to spectroscopic data of highly excited 39K singlet and triplet bound states. We predict positive scattering lengths for the 39K+39K and 41K+41K singlet potentials, as well as for the 41K+41K triplet potential, and a negative value for 39K+39K triplet scattering. From a study of the magnetic field dependence we conclude that 41K may be a bosonic atom with a Feshbach resonance in the magnetic field range where these atoms can be trapped in the f=1, mf=-1 hyperfine state, thus providing a possibility to switch between stable and instable condensates in a Bose-Einstein condensation experiment.
    Original languageEnglish
    Pages (from-to)R3726-R3729
    Number of pages4
    JournalPhysical Review A : Atomic, Molecular and Optical Physics
    Volume54
    Issue number5
    DOIs
    Publication statusPublished - 1996

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