2008/11/14 by Johann G. Danzl, Manfred J. Mark, Elmar Haller +7 · 1 citation
Chemistry · Physics and Astronomy · #Adiabatic process #Atomic and Subatomic Physics Research #Atomic physics #Chemistry #Cold Atom Physics and Bose-Einstein Condensates #Degenerate energy levels #Excited state #Feshbach resonance #Ground state #Molecule #Physics #Quantum mechanics #Rotational–vibrational spectroscopy #Singlet state #Spectroscopy #Spectroscopy and Laser Applications #Stimulated Raman adiabatic passage #cond-mat.other
paper · pdf · doi:10.1039/b820542f
6 figures, 1 table
arxiv created 2008/11/14 · openalex publication_date 2009/01/01 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 (see text for symbols)v = 73 > of the singlet X1 sigma(g)+ 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 (see text for symbols)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.