Two-color photoassociation spectroscopy of ytterbium atoms and the precise determinations ofs-wave scattering lengths

By performing high-resolution two-color photoassociation spectroscopy, we have successfully determined the binding energies of several of the last bound states of the homonuclear dimers of six different isotopes of ytterbium. These spectroscopic data are in excellent agreement with theoretical calculations based on a simple model potential, which very precisely predicts the s-wave scattering lengths of all 28 pairs of the seven stable isotopes. The s-wave scattering lengths for collision of two atoms of the same isotopic species are 13.33(18) nm for ¹⁶⁸Yb, 3.38(11) nm for ¹⁷⁰Yb, -0.15(19) nm for ¹⁷¹Yb, -31.7(3.4) nm for ¹⁷²Yb, 10.55(11) nm for ¹⁷³Yb, 5.55(8) nm for ¹⁷⁴Yb, and -1.28(23) nm for ¹⁷⁶Yb. The coefficient of the lead term of the long-range van der Waals potential of the Yb₂ molecule is C₆=1932(30) atomic units (Eₕa₀⁶≈9.573×10^-26 J nm⁶).