Authors: Torben A. Schulze1, Matthias W. Gempel1, Torsten Hartmann1, Maurice Petzold1, Silke Ospelkaus1, Ivo Temelkov 1,2, Horst Knoeckel1, and Eberhard Tiemann1
1: Institut für Quantenoptik, Leibniz University Hannover, Germany
2: Department of Physics, Sofia University, Bulgaria
Recently, ultra-cold polar molecules have attracted a lot of interest. Due to their strong dipole-dipole interaction, they are ideally suited for the study of quantum many-body phenomena with long-range and anisotropic interaction. NaK in its rovibronic ground state is a promising candidate for such studies, because of its large dipole moment of 2.72 Debye and because chemical reactions into homonuclear dimers are expected to be endothermic and therefore suppressed at ultra-cold temperature [PRA 81,060703(2010)]. We show our progress towards chemically stable polar 23Na40K molecules. In particular, we present our multi-channel analysis of the electronic ground and K(4p) excited state manifold and discuss possible coherent two-photon transfer paths from Feshbach molecules to rovibronic ground state molecules. The calculations are complemented by dark resonance spectroscopy on athermal molecular ensemble between the X 1S vibrational ground state and the a 3S system.
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