title: Molecular spectroscopy for ground-state transfer of ultracold RbCs molecules.
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.
authors.affiliation: Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
authors.forename: Markus
authors.initials: M
authors.lastname: Debatin
authors.forename: Tetsu
authors.initials: T
authors.lastname: Takekoshi
authors.forename: Raffael
authors.initials: R
authors.lastname: Rameshan
authors.forename: Lukas
authors.initials: L
authors.lastname: Reichsöllner
authors.forename: Francesca
authors.initials: F
authors.lastname: Ferlaino
authors.forename: Rudolf
authors.initials: R
authors.lastname: Grimm
authors.forename: Romain
authors.initials: R
authors.lastname: Vexiau
authors.forename: Nadia
authors.initials: N
authors.lastname: Bouloufa
authors.forename: Olivier
authors.initials: O
authors.lastname: Dulieu
authors.forename: Hanns-Christoph
authors.initials: HC
authors.lastname: Nägerl