1. Dark resonances for ground-state transfer of molecular quantum gases.
- Author
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Mark, M. J., Danzl, J. G., Haller, E., Gustavsson, M., Bouloufa, N., Dulieu, O., Salami, H., Bergeman, T., Ritsch, H., Hart, R., and Nägerl, H.-C.
- Subjects
RESONANT vibration ,DISSOCIATION (Chemistry) ,ENERGY transfer ,MATHEMATICAL physics ,QUANTUM chemistry - Abstract
One possible way to produce ultra-cold, high-phase-space-density quantum gases of molecules in the rovibronic ground state is given by molecule association from quantum-degenerate atomic gases on a Feshbach resonance and subsequent coherent optical multi-photon transfer into the rovibronic ground state. In ultra-cold samples of Cs
2 molecules, we observe two-photon dark resonances that connect the intermediate rovibrational level | v=73, J=2〉 with the rovibrational ground state | v=0, J=0〉 of the singlet X1 Σ ground-state potential. For precise dark resonance spectroscopy we exploit the fact that it is possible to efficiently populate the level | v=73, J=2〉 by two-photon transfer from the dissociation threshold with the stimulated Raman adiabatic passage (STIRAP) technique. We find that at least one of the two-photon resonances is sufficiently strong to allow future implementation of coherent STIRAP transfer of a molecular quantum gas to the rovibrational ground state | v=0, J=0〉. [ABSTRACT FROM AUTHOR]- Published
- 2009
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