Knoop, Steven; Mark, Michael; Ferlaino, Francesca; Danzl, Johann GIST Austria ; Kraemer, Tobias; Nägerl, Hanns; Grimm, Rudolf
We experimentally demonstrate Cs2 Feshbach molecules well above the dissociation threshold, which are stable against spontaneous decay on the time scale of 1s. 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.
Physical Review Letters
We thank S. Du ̈rr and T. Volz for fruitful discussions. We acknowledge support by the Austrian Science Fund (FWF) within No. SFB 15 (project part 16). S.K. is supported within the Marie Curie Intra-European Program of the European Commission. F.F. is supported within the Lise Meitner program of the FWF.
Knoop S, Mark M, Ferlaino F, et al. Metastable feshbach molecules in high rotational states. Physical Review Letters. 2008;100(8). doi:10.1103/PhysRevLett.100.083002
Knoop, S., Mark, M., Ferlaino, F., Danzl, J. G., Kraemer, T., Nägerl, H., & Grimm, R. (2008). Metastable feshbach molecules in high rotational states. Physical Review Letters, 100(8). https://doi.org/10.1103/PhysRevLett.100.083002
Knoop, Steven, Michael Mark, Francesca Ferlaino, Johann G Danzl, Tobias Kraemer, Hanns Nägerl, and Rudolf Grimm. “Metastable Feshbach Molecules in High Rotational States.” Physical Review Letters 100, no. 8 (2008). https://doi.org/10.1103/PhysRevLett.100.083002.
S. Knoop et al., “Metastable feshbach molecules in high rotational states,” Physical Review Letters, vol. 100, no. 8, 2008.
Knoop S, Mark M, Ferlaino F, Danzl JG, Kraemer T, Nägerl H, Grimm R. 2008. Metastable feshbach molecules in high rotational states. Physical Review Letters. 100(8).
Knoop, Steven, et al. “Metastable Feshbach Molecules in High Rotational States.” Physical Review Letters, vol. 100, no. 8, American Physical Society, 2008, doi:10.1103/PhysRevLett.100.083002.