Hyperfine, rotational, and vibrational structure of the triplet ground state of Rb molecules

Abstract

We have performed high-resolution two-photon dark-state spectroscopy of an ultracold gas of Rb molecules in the triplet ground state at a magnetic field of about 1000 G. The vibrational ladder as well as the hyperfine and low-lying rotational structure is mapped out. Energy shifts in the spectrum are observed due to singlet-triplet mixing at binding energies as deep as a few hundred GHz x h. This information together with data from other sources is used to optimize the potentials of the triplet and singlet states in a coupled-channel model. We find that the hyperfine structure depends weakly on the vibrational level. This provides a possible explanation for inaccuracies in recent Feshbach resonance calculations.

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• Observation of broad p-wave Feshbach resonances in ultracold ${}^{85}$Rb-${}^{87}$Rb mixtures
• Analyzing Feshbach resonances -- A ${}^6$Li -${}^{133}$Cs case study
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• Ultracold mixtures of metastable He and Rb: scattering lengths from ab initio calculations and thermalization measurements
• Shedding Light on Three-Body Recombination in an Ultracold Atomic Gas
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• Observation and Analysis of Resonant Coupling Between Near-Degenerate Levels of the 2 1Σg+ and 1 1 Πg States of Ultracold 85Rb2