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Spontaneous dissociation of long-range Feshbach molecules

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arxiv cond-mat/0408387 v2 pith:3GKD2ZQ5 submitted 2004-08-17 cond-mat.other

Thorsten Koehler , Eite Tiesinga , Paul S. Julienne This is my paper · ORCID
classification cond-mat.other
keywords moleculesdecaydissociationfeshbachlengthlifetimescatteringspontaneous
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abstract

We study the spontaneous dissociation of diatomic molecules produced in cold atomic gases via magnetically tunable Feshbach resonances. We provide a universal formula for the lifetime of these molecules that relates their decay to the scattering length and the loss rate constant for inelastic spin relaxation. Our universal treatment as well as our exact coupled channels calculations for $^{85}$Rb dimers predict a suppression of the decay over several orders of magnitude when the scattering length is increased. Our predictions are in good agreement with recent measurements of the lifetime of $^{85}$Rb$_2$.

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