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arXiv · 1009.2075

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

Christoph Strauss·Tetsu Takekoshi·Florian Lang·Klaus Winkler·Rudolf Grimm·Johannes Hecker Denschlag·Eberhard Tiemann
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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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Christoph Strauss, Tetsu Takekoshi, Florian Lang, Klaus Winkler, Rudolf Grimm, Johannes Hecker Denschlag, Eberhard Tiemann. 2010-10-14. Hyperfine, rotational, and vibrational structure of the triplet ground state of Rb molecules. https://doi.org/10.1103/physreva.82.052514

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