Precision molecular spectroscopy for ground state transfer of molecular quantum gases

@article{B820542F,
  title = {Precision molecular spectroscopy for ground state transfer of molecular quantum gases},
  author = {J. G. Danzl, M. J. Mark, E. Haller, M. Gustavsson, N. Bouloufa, O. Dulieu, H. Ritsch, R. Hart and H.-C. N"agerl},
  journal = {Faraday Discuss.},
  volume = {142},
  pages = {283-295},
  year = {2009},
  doi = {10.1039/B820542F},
  abstract = {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 0u+ 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 X1Σg+ 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.};
  arxiv = {https://arxiv.org/abs/0811.2374},
  url = {http://dx.doi.org/10.1039/B820542F}
}