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Theoretical studying the Rydberg autoionization resonances in spectra of the lanthanides atoms (ytterbium) is carried out within the relativistic many-body perturbation theory and generalized relativistic energy approach (Gell-Mann and Low S-matrix formalism). The zeroth approximation of the relativistic perturbation theory is provided by the optimized DiracFock and Dirac-Kohn-Sham ones. Optimization has been fulfilled by means of introduction of the parameter to the Fock and Kohn-Sham exchange potentials and further minimization of the gauge-non-invariant contributions into radiation width of atomic levels with using relativistic orbital bases, generated by the corresponding zeroth approximation Hamiltonians. The accurate theoretical results on the autoionization 4f[F7/2]6s np[5/2]2, 4f 13 [F7/2] 6s nf[5/2]2 resonances energies and widths are presented and compared with experimental data, obtained on the basis of the laser polarization spectroscopy method.

THEORETICAL STUDYING SPECTRA OF YTTERBIUM ATOM ON THE BASIS OF RELATIVISTIC MANY-BODY PERTURBATION THEORY: RYDBERG RESONANCES