title: Spontaneous dissociation of long-range Feshbach molecules.
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 85Rb 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 85Rb(2).
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
authors.forename: Thorsten
authors.initials: T
authors.lastname: Köhler
authors.forename: Eite
authors.initials: E
authors.lastname: Tiesinga
authors.forename: Paul S
authors.initials: PS
authors.lastname: Julienne