Evidence for association of triatomic molecule in ultracold ${}^{23}$Na${}^{40}$K and ${}^{40}$K mixture

Abstract

Ultracold assembly of diatomic molecules has enabled great advances in controlled chemistry, ultracold chemical physics, and quantum simulation with molecules. Extending the ultracold association to triatomic molecules will offer many new research opportunities and challenges in these fields. A possible approach is to form triatomic molecules in the ultracold atom and diatomic molecule mixture by employing the Feshbach resonance between them. Although the ultracold atom-diatomic-molecule Feshbach resonances have been observed recently, utilizing these resonances to form triatomic molecules remains challenging. Here we report on the evidence of the association of triatomic molecules near the Feshbach resonances between ${}^{23}$Na${}^{40}$K molecules in the rovibrational ground state and ${}^{40}$K atoms. We apply a radio-frequency pulse to drive the free-bound transition and monitor the loss of ${}^{23}$Na${}^{40}$K molecules. The association of triatomic molecules manifests itself as an additional loss feature in the radio-frequency spectra, which can be distinguished from the atomic loss feature.The binding energy of triatomic molecule is estimated from the measurement. Our work is helpful to understand the complex ultracold atom-molecule Feshbach resonance and may open up an avenue towards the preparation and control of ultracold triatomic molecules.

16 pages, 5 figures

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Cited by in corpus (13)

• Ultracold Sticky Collisions: Theoretical and Experimental Status
• Diatomic molecules of alkali-metal and alkaline-earth-metal atoms: interaction potentials, dipole moments, and polarizabilities
• Pound-Drever-Hall Feedforward: Laser Phase Noise Suppression beyond Feedback
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• Preparation of a quantum degenerate mixture of ${}^{23}$Na${}^{40}$K molecules and ${}^{40}$K atoms
• Ab initio calculation of the spectrum of Feshbach resonances in NaLi + Na collisions
• Symmetry breaking in sticky collisions between ultracold molecules
• Mass Ratio Dependence of Three-Body Resonance Lifetimes in 1D and 3D
• Cold hybrid electrical-optical ion trap
• Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture
• Observation of modulation-induced Feshbach resonance
• Formation of ultracold triatomic molecules by electric microwave association