Abstract
Configuration with two open shells of the type msnl from the spectra of Yb I and Lu II are analysed with respect to the hyperfine interaction. Radial integrals are evaluated from relativistic self-consistent-field wave-functions. Formulas are presented for the magnetic dipole and electric quadrupole interaction constants using the effective-operator formalism on LS coupled wavefunctions. The spin polarization contributions to the magnetic dipole interaction constants in a general msnl configuration are also presented. From such configurations in Yb I and Lu II, mean values of the electric quadrupole moments have been evaluated, giving Q(173Yb) = 3.6 b and Q(175Lu) = 5.3 b (uncorrected for the Sternheimer effect).
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