Formation of ultracold weakly bound dimers of bosonic ${}^{23}{\text{Na}}^{39}\text{K}$

Abstract

We create weakly bound bosonic ${}^{23}{\text{Na}}^{39}\text{K}$ molecules in a mixture of ultracold ${}^{23}\text{Na}$ and ${}^{39}\text{K}$. The creation is done in the vicinity of a so far undetected Feshbach resonance at about $196\text{G}$ 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 ${}^{23}\text{Na}$ and ${}^{39}\text{K}$. We find an overall optimal efficiency of $6\%$ referring to the ${}^{39}\text{K}$ atom number. The measured lifetime of the molecules in the bath of trapped atoms is about $0.3\text{ms}$.

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• Probing photoinduced two-body loss of ultracold non-reactive bosonic ${}^{23}$Na${}^{87}$Rb and ${}^{23}$Na${}^{39}$K molecules
• Quantum control of molecules for fundamental physics
• A High Phase-Space Density Gas of NaCs Feshbach Molecules
• Active stabilization of kilogauss magnetic fields to the ppm level for magnetoassociation on ultranarrow Feshbach resonances
• Hyperfine dependent atom-molecule loss analyzed by the analytic solution of few-body loss equations
• Formation of ultracold ${}^{39}$K${}^{133}$Cs Feshbach molecules
• Delta-Kick Collimation of Heteronuclear Feshbach Molecules
• Formation of ultracold triatomic molecules by electric microwave association