title: Metastable feshbach molecules in high rotational states.
abstract: We experimentally demonstrate Cs2 Feshbach molecules well above the dissociation threshold, which are stable against spontaneous decay on the time scale of 1 s. An optically trapped sample of ultracold dimers is prepared in a high rotational state and magnetically tuned into a region with a negative binding energy. The metastable character of these molecules arises from the large centrifugal barrier in combination with negligible coupling to states with low rotational angular momentum. A sharp onset of dissociation with increasing magnetic field is mediated by a crossing with a lower rotational dimer state and facilitates dissociation on demand with a well-defined energy.
authors: Institut für Experimentalphysik and Forschungszentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
authors: S
authors: S
authors: Knoop
authors: M
authors: M
authors: Mark
authors: F
authors: F
authors: Ferlaino
authors: J G
authors: JG
authors: Danzl
authors: T
authors: T
authors: Kraemer
authors: H-C
authors: HC
authors: Nägerl
authors: R
authors: R
authors: Grimm