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

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

2010-09-10

arxiv.org/abs/1009.2075v2

Phys. Rev. A 82, 052514 (2010)

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevA.82.052514

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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