Double-excited narrow autoionization states of ytterbium atom

We report the results of theoretical and experimental research of double-excited narrow autoionization states of the ytterbium atom near the ionization limit. The energy of autoionization states of the 5d2, 6p2, 5d6p and 7s6p configurations was calculated. Perturbation theory with a model zero-order approximation was used in this calculation. The autoionization states of the 7s6p configuration were experimentally detected by using the method of multistep laser excitation and ionization of atoms.