Two-photon photoassociation spectroscopy of CsYb: Ground-state interaction potential and interspecies scattering lengths
We perform two-photon photoassociation spectroscopy of the heteronuclear CsYb molecule to measure the binding energies of near-threshold vibrational levels of the X 2Σ1/2 + molecular ground state. We report results for 133Cs170Yb , 133Cs173Yb , and 133Cs174Yb , in each case determining the energy of several vibrational levels including the least-bound state. We fit an interaction potential based on electronic structure calculations to the binding energies for all three isotopologs and find that the ground-state potential supports 77 vibrational levels. We use the fitted potential to predict the interspecies s -wave scattering lengths for all seven Cs+Yb isotopic mixtures.