Voges, Kai K.
[Author];
Gersema, Philipp
[Author];
Hartmann, Torsten
[Author];
Schulze, Torben A.
[Author];
Zenesini, Alessandro
[Author];
Ospelkaus, Silke
[Author]
A pathway to ultracold bosonic 23Na39K ground state molecules
- [published Version]
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Description:
We spectroscopically investigate a pathway for the conversion of 23Na39K Feshbach molecules into rovibronic ground state molecules via stimulated Raman adiabatic passage. Using photoassociation spectroscopy from the diatomic scattering threshold in the a 3Σ+ potential, we locate the resonantly mixed electronically excited intermediate states |B1Π, v=8〉 and |c3Σ+, v=30〉 which, due to their singlet-triplet admixture, serve as an ideal bridge between predominantly a 3Σ+ Feshbach molecules and pure X 1Σ+ ground state molecules. We investigate their hyperfine structure and present a simple model to determine the singlet-triplet coupling of these states. Using Autler-Townes spectroscopy, we locate the rovibronic ground state of the 23Na39K molecule (X1Σ+, v=0, N=0〉) and the second rotationally excited state N = 2 to unambiguously identify the ground state. We also extract the effective transition dipole moment from the excited to the ground state. Our investigations result in a fully characterized scheme for the creation of ultracold bosonic 23Na39K ground state molecules.