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

Abstract

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, ${\mathrm{Cs}}^{+}$, ${\mathrm{Ba}}^{2+}$, ${\mathrm{Xe}}^{+}$, and ${\mathrm{I}}^{+}$, and for ionization of the 4f subshell in ${\mathrm{Eu}}^{+}$, ${\mathrm{Tm}}^{+}$, ${\mathrm{Yb}}^{2+}$, ${\mathrm{Lu}}^{3+}$, and ${\mathrm{W}}^{+}$. .AE