Giant resonance effects in the electron-impact ionization of heavy atoms and ions

The origin of giant resonance effects in the electron-impact ionization of heavy (Z>50) atoms and ions is discussed in terms of the potentials governing the scattering states. Calculations are presented for electron-impact ionization of the 4d subshell in Xe, Cs⁺, Ba²⁺, Xe⁺, and I⁺, and for ionization of the 4f subshell in Eu⁺, Tm⁺, Yb²⁺, Lu³⁺, and W⁺. .AE