Rostock 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 12: Ultra-cold atoms, ions and BEC
A 12.20: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik
Feshbach spectroscopy, Feshbach molecule creation and molecular spectroscopy in an ultracold bosonic mixture of 23Na and 39K — •Philipp Gersema, Kai Konrad Voges, Jannis Schnars, Torsten Hartmann, Torben Alexander Schulze, Eberhard Tiemann, Alessandro Zenesini, and Silke Ospelkaus — Institute of Quantum Optics, Leibniz University Hannover
Ultracold mixtures of alkaline atoms are a versatile tool to investigate mixture phenomena and can be used to create ultracold polar ground state molecules, utilizing the STIRAP technique. Among the alkali atoms, sodium and potassium serve as ideal candidates for the production and investigation of such molecules. Cooling strategies for both species are well explored and NaK molecules in their rovibrational ground state 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 bosonic combinations have remained elusive.
We present a detailed study of 21 different scattering features in various spin state combinations of 23Na39K up to a magnetic field strength of 750 G. These comprise Feshbach resonances, zero crossings of the scattering length as well as inelastic loss channels. With this results we refine the potential energy curves for the NaK molecule, giving an improvement not only for the bosonic but also the fermionic case. Furthermore we use this knowledge to create Feshbach molecules and perform spectroscopy to the excited B1Π and c3Σ manifold and the X1Σ ground state of the NaK molecule.