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Ultracold assembly of diatomic molecules has enabled great advances incontrolled chemistry, ultracold chemical physics, and quantum simulation withmolecules. Extending the ultracold association to triatomic molecules willoffer many new research opportunities and challenges in these fields. Apossible approach is to form triatomic molecules in the ultracold atom anddiatomic molecule mixture by employing the Feshbach resonance between them.Although the ultracold atom-diatomic-molecule Feshbach resonances have beenobserved recently, utilizing these resonances to form triatomic moleculesremains challenging. Here we report on the evidence of the association oftriatomic molecules near the Feshbach resonances between $^{23}$Na$^{40}$Kmolecules in the rovibrational ground state and $^{40}$K atoms. We apply aradio-frequency pulse to drive the free-bound transition and monitor the lossof $^{23}$Na$^{40}$K molecules. The association of triatomic moleculesmanifests itself as an additional loss feature in the radio-frequency spectra,which can be distinguished from the atomic loss feature.The binding energy oftriatomic molecule is estimated from the measurement. Our work is helpful tounderstand the complex ultracold atom-molecule Feshbach resonance and may openup an avenue towards the preparation and control of ultracold triatomicmolecules.

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