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Abstract: One possible way to produce ultracold, high-phase-space-density quantum gasesof molecules in the rovibronic ground state is given by molecule associationfrom quantum-degenerate atomic gases on a Feshbach resonance and subsequentcoherent optical multi-photon transfer into the rovibronic ground state. Inultracold samples of Cs 2 molecules, we observe two-photon dark resonances thatconnect the intermediate rovibrational level |v=73,J=2> with the rovibrationalground state |v=0,J=0> of the singlet $X^1\Sigma g^+$ ground state potential.For precise dark resonance spectroscopy we exploit the fact that it is possibleto efficiently populate the level |v=73,J=2> by two-photon transfer from thedissociation threshold with the stimulated Raman adiabatic passage STIRAPtechnique. We find that at least one of the two-photon resonances issufficiently strong to allow future implementation of coherent STIRAP transferof a molecular quantum gas to the rovibrational ground state |v=0,J=0>.



Autor: Manfred J. Mark, Johann G. Danzl, Elmar Haller, Mattias Gustavsson, Nadia Bouloufa, Olivier Dulieu, Houssam Salami, Tom Bergeman,

Fuente: https://arxiv.org/



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