Chemical Physics Cooling molecules to nanokelvin temperatures places them under the tightest quantum mechanical constraints. Studies in this intriguing regime have been limited to diatomics: Two cold atoms can be lured together into weakly associated Feshbach resonances, which lasers can then shift into a more stable molecular state. Yang et al. now report the observation of triatomic Feshbach resonances in ultracold collisions between potassium (K) atoms and sodium potassium (NaK) diatomics. The findings potentially set the stage for the preparation and study of ultracold triatomic molecules. Science , this issue p. [261][1] [1]: /lookup/doi/10.1126/science.aau5322Chemical Physics Cooling molecules to nanokelvin temperatures places them under the tightest quantum mechanical constraints. Studies in this intriguing regime have been limited to diatomics: Two cold atoms can be lured together into weakly associated Feshbach resonances, which lasers can then shift into a more stable molecular state. Yang et al. now report the observation of triatomic Feshbach resonances in ultracold collisions between potassium (K) atoms and sodium potassium (NaK) diatomics. The findings potentially set the stage for the preparation and study of ultracold triatomic molecules. Science , this issue p. [261][1] [1]: /lookup/doi/10.1126/science.aau5322

ScienceJan 17, 20190 citations

Feshbach resonances in Na23+K39 mixtures and refined molecular potentials for the NaK molecule

Torsten Hartmann, Torben Schulze, Kai K. Voges +5 more

We present a detailed study of interspecies Feshbach resonances of the bosonic $^{23}\mathrm{Na}+^{39}\mathrm{K}$ mixture for magnetic fields up to $750\phantom{\rule{0.16em}{0ex}}\mathrm{G}$ in various collision channels. A total of 14 Feshbach resonances are reported, as well as four zero crossings of the scattering length and three inelastic two-body loss features. We use the observed magnetic-field locations of the resonant features together with the known data on $^{23}\mathrm{Na}+^{40}\mathrm{K}$ to refine the singlet and triplet ground-state potentials of NaK and achieve a consistent description of Feshbach resonances for both the Bose-Bose mixture of $^{23}\mathrm{Na}+^{39}\mathrm{K}$ and the Bose-Fermi mixture of $^{23}\mathrm{Na}+^{40}\mathrm{K}$ . We also discuss the influence of the interplay between inelastic two-body and three-body processes on the observation of a Feshbach resonance.We present a detailed study of interspecies Feshbach resonances of the bosonic $^{23}\mathrm{Na}+^{39}\mathrm{K}$ mixture for magnetic fields up to $750\phantom{\rule{0.16em}{0ex}}\mathrm{G}$ in various collision channels. A total of 14 Feshbach resonances are reported, as well as four zero crossings of the scattering length and three inelastic two-body loss features. We use the observed magnetic-field locations of the resonant features together with the known data on $^{23}\mathrm{Na}+^{40}\mathrm{K}$ to refine the singlet and triplet ground-state potentials of NaK and achieve a consistent description of Feshbach resonances for both the Bose-Bose mixture of $^{23}\mathrm{Na}+^{39}\mathrm{K}$ and the Bose-Fermi mixture of $^{23}\mathrm{Na}+^{40}\mathrm{K}$. We also discuss the influence of the interplay between inelastic two-body and three-body processes on the observation of a Feshbach resonance.

arXiv:1810.00608Physical Review AMar 27, 201918 citations

Feshbach Resonances in Ultracold Gases

Eite Tiesinga, Cheng Chin, Rudolf Grimm +1 more

APSMay 1, 200911 citations

High precision Feshbach spectroscopy of ultracold cesium collisions

Cheng Chin, Vladan Vuletić, Andrew J. Kerman +1 more

Nuclear Physics AMar 1, 20019 citations

Feshbach resonances and weakly bound molecular states of boson-boson and boson-fermion NaK pairs

Alexandra Viel, Andrea Simoni

We conduct a theoretical study of magnetically induced Feshbach resonances and near-threshold bound states in isotopic NaK pairs. Our calculations accurately reproduce Feshbach spectroscopy data on $\mathrm{Na}^{40}\mathrm{K}$ and explain the origin of the observed multiplets in the $p$ wave [Phys. Rev. A 85, 051602(R) (2012)]. We apply the model to predict scattering and bound state threshold properties of the boson-boson $\mathrm{Na}^{39}\mathrm{K}$ and $\mathrm{Na}^{41}\mathrm{K}$ systems. We find that the $\mathrm{Na}^{39}\mathrm{K}$ isotopic pair presents broad magnetic Feshbach resonances and favorable ground-state features for producing nonreactive polar molecules by two-photon association. Broad $s$ -wave resonances are also predicted for $\mathrm{Na}^{41}\mathrm{K}$ collisions.We conduct a theoretical study of magnetically induced Feshbach resonances and near-threshold bound states in isotopic NaK pairs. Our calculations accurately reproduce Feshbach spectroscopy data on $\mathrm{Na}^{40}\mathrm{K}$ and explain the origin of the observed multiplets in the $p$ wave [Phys. Rev. A 85, 051602(R) (2012)]. We apply the model to predict scattering and bound state threshold properties of the boson-boson $\mathrm{Na}^{39}\mathrm{K}$ and $\mathrm{Na}^{41}\mathrm{K}$ systems. We find that the $\mathrm{Na}^{39}\mathrm{K}$ isotopic pair presents broad magnetic Feshbach resonances and favorable ground-state features for producing nonreactive polar molecules by two-photon association. Broad $s$-wave resonances are also predicted for $\mathrm{Na}^{41}\mathrm{K}$ collisions.

arXiv:1604.00234Physical Review AApr 5, 201624 citations

We present a detailed study of interspecies Feshbach resonances of the bosonic

^{23}\mathrm{Na}+^{39}\mathrm{K}

mixture for magnetic fields up to

750\phantom{\rule{0.16em}{0ex}}\mathrm{G}

in various collision channels. A total of 14 Feshbach resonances are reported, as well as four zero crossings of the scattering length and three inelastic two-body loss features. We use the observed magnetic-field locations of the resonant features together with the known data on

^{23}\mathrm{Na}+^{40}\mathrm{K}

to refine the singlet and triplet ground-state potentials of NaK and achieve a consistent description of Feshbach resonances for both the Bose-Bose mixture of

^{23}\mathrm{Na}+^{39}\mathrm{K}

and the Bose-Fermi mixture of

^{23}\mathrm{Na}+^{40}\mathrm{K}

. We also discuss the influence of the interplay between inelastic two-body and three-body processes on the observation of a Feshbach resonance.

We conduct a theoretical study of magnetically induced Feshbach resonances and near-threshold bound states in isotopic NaK pairs. Our calculations accurately reproduce Feshbach spectroscopy data on

\mathrm{Na}^{40}\mathrm{K}

and explain the origin of the observed multiplets in the

p

wave [Phys. Rev. A 85, 051602(R) (2012)]. We apply the model to predict scattering and bound state threshold properties of the boson-boson

\mathrm{Na}^{39}\mathrm{K}

and

\mathrm{Na}^{41}\mathrm{K}

systems. We find that the

\mathrm{Na}^{39}\mathrm{K}

isotopic pair presents broad magnetic Feshbach resonances and favorable ground-state features for producing nonreactive polar molecules by two-photon association. Broad

s

-wave resonances are also predicted for

\mathrm{Na}^{41}\mathrm{K}

collisions.