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We employ two-photon spectroscopy to study the vibrational states of the triplet ground state potential (a 3 Σ + ) of the 23 Na 6 Li molecule. Pairs of Na and Li atoms in an ultracold mixture are photoassociated into an excited triplet molecular state, which in turn is coupled to vibrational states of the triplet ground potential. Vibrational state binding energies, line strengths, and potential fitting parameters for the triplet ground a 3 Σ + potential are reported. We also observe rotational splitting in the lowest vibrational state.more » « less
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We perform photoassociation spectroscopy in an ultracold 23 Na– 6 Li mixture to study the c 3 Σ + excited triplet molecular potential. We observe 50 vibrational states and their substructure to an accuracy of 20 MHz, and provide line strength data from photoassociation loss measurements. An analysis of the vibrational line positions using near-dissociation expansions and a full potential fit is presented. This is the first observation of the c 3 Σ + potential, as well as photoassociation in the NaLi system.more » « less
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