Hyperfine, rotational, and vibrational structure of the a3Σu+ state of Rb872
Abstract
We have performed high-resolution two-photon dark-state spectroscopy of an ultracold gas of Rb872 molecules in the a3Σu+ state at a magnetic field of about 1000 G. The vibrational ladder as well as the hyperfine and low-lying rotational structure are mapped out. Energy shifts in the spectrum are observed due to singlet-triplet mixing at binding energies as deep as a few hundred GHz×h. This information, together with data from other sources, is used to optimize the potentials of the a3Σu+ and X1Σg+ 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.
- Publication:
-
Physical Review A
- Pub Date:
- November 2010
- DOI:
- arXiv:
- arXiv:1009.2075
- Bibcode:
- 2010PhRvA..82e2514S
- Keywords:
-
- 33.20.-t;
- 37.10.Pq;
- 37.10.Jk;
- 42.50.-p;
- Molecular spectra;
- Trapping of molecules;
- Atoms in optical lattices;
- Quantum optics;
- Physics - Atomic Physics;
- Condensed Matter - Other Condensed Matter
- E-Print:
- Phys. Rev. A 82, 052514 (2010)