Formation of ultracold weakly bound dimers of bosonic (NaK)-Na-23-K-39

Year: 2020

Authors: Voges K.K., Gersema P., Hartmann T., Schulze T.A., Zenesini A., Ospelkaus S.

Autors Affiliation: Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany

Abstract: We create weakly bound bosonic (NaK)-Na-23-K-39 molecules in a mixture of ultracold Na-23 and K-39. The creation is done in the vicinity of a so far undetected Feshbach resonance at about 196 G which we identify in this work by atom-loss spectroscopy. We investigate the involved molecular state by performing destructive radio-frequency binding-energy measurements. For the constructive molecule creation we use radio-frequency pulses with which we assemble up to 6000 molecules. We analyze the molecule creation efficiency as a function of the radio-frequency pulse duration and the atom number ratio between Na-23 and K-39. We find an overall optimal efficiency of 6% referring to the K-39 atom number. The measured lifetime of the molecules in the bath of trapped atoms is about 0.3 ms.


Volume: 101      Pages from: 042704-1  to: 042704-6

KeyWords: Feshbach molecules, Cold Atoms, Dipolar Gases
DOI: 10.1103/PhysRevA.101.042704

Citations: 8
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