Molecular spectroscopy for ground-state transfer of ultracold RbCs molecules |
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Authors: | Debatin Markus Takekoshi Tetsu Rameshan Raffael Reichsöllner Lukas Ferlaino Francesca Grimm Rudolf Vexiau Romain Bouloufa Nadia Dulieu Olivier Nägerl Hanns-Christoph |
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Institution: | Institut für Experimentalphysik und Zentrum für Quantenphysik, Universit?t Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria. |
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Abstract: | We perform one- and two-photon high resolution spectroscopy on ultracold samples of RbCs Feshbach molecules with the aim to identify a suitable route for efficient ground-state transfer in the quantum-gas regime to produce quantum gases of dipolar RbCs ground-state molecules. One-photon loss spectroscopy allows us to probe deeply bound rovibrational levels of the mixed excited (A(1)Σ(+)-b(3)Π)0(+) molecular states. Two-photon dark state spectroscopy connects the initial Feshbach state to the rovibronic ground state. We determine the binding energy of the lowest rovibrational level |v' = 0, J' = 0> of the X(1)Σ(+) ground state to be D = 3811.5755(16) cm(-1), a 300-fold improvement in accuracy with respect to previous data. We are now in the position to perform stimulated two-photon Raman transfer to the rovibronic ground state. |
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