Resonance excitation of bound and autoionization states of the ytterbium atom in the course of three-photon ionization
Gomonai A. I., Zapesochnyi I. P.
Three-photon single ionization of the ytterbium atom in the wavelength interval 430-472 nm has been studied for the first time. The plot of the yield of Yb+ ions versus the laser wavelength has a large number of resonance peaks, which stem from the excitation of bound and autoionization states. These results are evidence that transitions involving the excitation of the 4fH inner subshell play an extremely important role in the ionization of the ytterbium atom.