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We spectroscopically investigate a pathway for the conversion of$^{23}\textrm{Na}^{39}\textrm{K}$ Feshbach molecules into rovibronic groundstate molecules via STImulated Raman Adiabatic Passage (STIRAP). Usingphotoassociation spectroscopy from the diatomic scattering threshold in the$a^3\Sigma^+$ potential, we locate the resonantly mixed electronically excitedintermediate states $|B^1\Pi, v=8\rangle$ and $|c^3\Sigma^+, v=30\rangle$which, due to their singlet-triplet admixture, serve as an ideal bridge betweenpredominantly $a^3\Sigma^+$ Feshbach molecules and pure $X^1\Sigma^+$ groundstate molecules. We investigate their hyperfine structure and present a simplemodel to determine the singlet-triplet coupling of these states. UsingAutler-Townes spectroscopy, we locate the rovibronic ground state of the$^{23}\textrm{Na}^{39}\textrm{K}$ molecule ($|X^1\Sigma^+, v=0, N=0\rangle$)and the second rotationally excited state $N=2$ to unambiguously identify theground state. We also extract the effective transition dipole moment from theexcited to the ground state. Our investigations result in a fully characterizedscheme for the creation of ultracold bosonic $^{23}\textrm{Na}^{39}\textrm{K}$ground state molecules.

A pathway to ultracold bosonic $^{23}\textrm{Na}^{39}\textrm{K}$ ground state molecules