Electron-impact ionization of the Pb atom

Electron-impact ionization cross sections are calculated for the ground configuration of the Pb atom. Time-dependent close-coupling cross sections for the direct ionization of the 6p subshell are combined with distorted-wave cross sections for the direct ionization of the 6s subshell and distorted-wave cross sections for the 6s -> nl excitation-autoionization contributions to compare with crossed-beams measurements made at Queen's University of Belfast, N. Ireland.