Electron-helium S-wave model benchmark calculations. II. Double ionization, single ionization with excitation, and double excitation

Bartlett, P.L. and Stelbovics, A.T. (2010) Electron-helium S-wave model benchmark calculations. II. Double ionization, single ionization with excitation, and double excitation. Physical Review A - Atomic, Molecular, and Optical Physics, 81 (2). Article number 022716 .

Abstract

The propagating exterior complex scaling (PECS) method is extended to all four-body processes in electron impact on helium in an S-wave model. Total and energy-differential cross sections are presented with benchmark accuracy for double ionization, single ionization with excitation, and double excitation (to autoionizing states) for incident-electron energies from threshold to 500 eV. While the PECS three-body cross sections for this model given in the preceding article are in good agreement with other methods, there are considerable discrepancies for these four-body processes. With this model we demonstrate the suitability of the PECS method for the complete solution of the electron-helium system.