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

Abstract

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 ^{168}Yb, 3.38(11) nm for ^{170}Yb, -0.15(19) nm for ^{171}Yb, -31.7(3.4) nm for ^{172}Yb, 10.55(11) nm for ^{173}Yb, 5.55(8) nm for ^{174}Yb, and -1.28(23) nm for ^{176}Yb. The coefficient of the lead term of the long-range van der Waals potential of the Yb_2 molecule is C_6=1932(30) atomic units $(E_h{a}_0^6\approx 9.573\times 10^{-26}$ J nm^6).

9 pages, 7 figures

References in corpus (3)

• Degenerate Fermi Gases of Ytterbium
• Bose-Einstein Condensation of an Ytterbium Isotope
• Study of the Born-Oppenheimer Approximation for Mass-Scaling of Cold Collision Properties

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