Spontaneous dissociation of long-range Feshbach molecules

Details Spontaneous dissociation of long-range Feshbach molecules Spontaneous dissociation of long-range Feshbach molecules

2004-08-17

arxiv.org/abs/cond-mat/0408387v2

Phys. Rev. Lett. 94, 020402 (2005)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 2 figures (final version)

Scientific paper

10.1103/PhysRevLett.94.020402

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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