Danzl, Johann GIST Austria ; Mark, Manfred; Haller, Elmar; Gustavsson, Mattias; Bouloufa, Nadia; Dulieu, Olivier; Ritsch, Helmut; Hart, Russell; Nägerl, Hanns
One possibility for the creation of ultracold, high phase space density quantum gases of molecules in the rovibronic ground state relies on first associating weakly-bound molecules from quantum-degenerate atomic gases on a Feshbach resonance and then transferring the molecules via several steps of coherent two-photon stimulated Raman adiabatic passage (STIRAP) into the rovibronic ground state. Here, in ultracold samples of Cs2 Feshbach molecules produced out of ultracold samples of Cs atoms, we observe several optical transitions to deeply-bound rovibrational levels of the excited 0 u+ molecular potentials with high resolution. At least one of these transitions, although rather weak, allows efficient STIRAP transfer into the deeply-bound vibrational level v = 73> of the singlet X 1Σg+ ground state potential, as recently demonstrated (J. G. Danzl, E. Haller, M. Gustavsson, M. J. Mark, R. Hart, N. Bouloufa, O. Dulieu, H. Ritsch, and H.-C. Nägerl, Science, 2008, 321, 1062). From this level, the rovibrational ground state v = 0, J = 0> can be reached with one more transfer step. In total, our results show that coherent ground state transfer for Cs2 is possible using a maximum of two successive two-photon STIRAP processes or one single four-photon STIRAP process.
We are indebted to R. Grimm for generous support and we thank T. Bergeman, H. Salami, J. Hutson, J. Aldegunde, and E. Tiemann for valuable discussions. We gratefully acknowledge funding by the Austrian Ministry of Science and Research (BMWF) and the Austrian Science Fund (FWF) in the form of a START prize grant and by the European Science Foundation (ESF) in the framework of the EuroQUAM collective research project QuDipMol. R. H. acknowledges support by the European Union in form of a Marie Curie International Incoming Fellowship (IIF).
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Danzl JG, Mark M, Haller E, et al. Precision molecular spectroscopy for ground state transfer of molecular quantum gases. Faraday Discussions. 2009;142:283-295. doi:10.1039/b820542f
Danzl, J. G., Mark, M., Haller, E., Gustavsson, M., Bouloufa, N., Dulieu, O., … Nägerl, H. (2009). Precision molecular spectroscopy for ground state transfer of molecular quantum gases. Faraday Discussions. Royal Society of Chemistry. https://doi.org/10.1039/b820542f
Danzl, Johann G, Manfred Mark, Elmar Haller, Mattias Gustavsson, Nadia Bouloufa, Olivier Dulieu, Helmut Ritsch, Russell Hart, and Hanns Nägerl. “Precision Molecular Spectroscopy for Ground State Transfer of Molecular Quantum Gases.” Faraday Discussions. Royal Society of Chemistry, 2009. https://doi.org/10.1039/b820542f.
J. G. Danzl et al., “Precision molecular spectroscopy for ground state transfer of molecular quantum gases,” Faraday Discussions, vol. 142. Royal Society of Chemistry, pp. 283–295, 2009.
Danzl JG, Mark M, Haller E, Gustavsson M, Bouloufa N, Dulieu O, Ritsch H, Hart R, Nägerl H. 2009. Precision molecular spectroscopy for ground state transfer of molecular quantum gases. Faraday Discussions. 142, 283–295.
Danzl, Johann G., et al. “Precision Molecular Spectroscopy for Ground State Transfer of Molecular Quantum Gases.” Faraday Discussions, vol. 142, Royal Society of Chemistry, 2009, pp. 283–95, doi:10.1039/b820542f.