Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 28: Poster Session - Atomic Physics IV
A 28.3: Poster
Donnerstag, 12. März 2020, 16:00–18:00, Empore Lichthof
Ultracold bosonic 23Na39K spin polarized ground state molecules and collisional properties in an atomic ensemble — •Philipp Gersema, Kai Konrad Voges, Mara Meyer zum alten Borgloh, Torsten Hartmann, Torben Alexander Schulze, Alessandro Zenesini, and Silke Ospelkaus — Institute of Quantum Optics, Leibniz University Hannover
Ultracold polar ground state molecules provide an excellent basis for the studies of quantum chemistry and exotic dipolar quantum phenomena. Rovibrational NaK ground state molecules feature a large dipole moment as well as chemical stability against exchange reactions. While the fermionic isotope combination 23Na40K has been subject to several previous studies, investigations of the bosonic combination remained elusive.
We present for the first time the production of bosonic spin polarized ground state molecules, by transferring weakly bound molecules to the absolute ground state, utilizing the stimulated Raman adiabatic passage (STIRAP). Starting from an ultracold atomic ensemble we use a Feshbach resonance to create weakly bound molecules. Spectroscopic studies of the excited B1Π and c3Σ manifold and the X1Σ ground state of the NaK molecule were performed to find a bridging state between the triplet dominated weakly bound dimers and the singlet ground state. The STIRAP pulse is done within 12 µs and has an efficiency of around 70 %, creating up to 4200 molecules. Finally we investigate the collisional properties of the ground state molecules in the 1064 nm optical dipole trap with and without atoms in different spin states.