Abstract
A theoretical study of the autoionization resonances in the spectra of lanthanide atoms (ytterbium) was carried out within the relativistic many-body perturbation theory and the generalized relativistic energy approach (the Gell-Mann and Low S-matrix formalism). The accurate results on the autoionization resonance energies and widths in ytterbium are presented with correctly accounting for the exchange correlation and relativistic corrections and are compared with the other available theoretical and experimental data.
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