Precollision and postcollision electron-electron correlation effects for intermediate-energy proton-impact ionization of helium

M. Foster, J. L. Peacher, M. Schulz, A. Hasan, D. H. Madison
2005 Physical Review A. Atomic, Molecular, and Optical Physics  
We report fully differential cross sections ͑FDCS͒ for the single ionization of helium by a 75 keV incident energy proton. Previous three-body distorted wave ͑3DW͒ calculations for this collision system are in poor agreement with the absolute magnitude of the experimental measurements. The 3DW approximation treats the four-body problem as an effective three-body problem in which the passive electron does not participate in the collision. We have developed a full four-body approach in which the
more » ... roach in which the passive electron fully participates in the collision. It will be shown that the FDCS is very sensitive to the treatment of the passive electron-ejected electron interaction. Results of our full four-body approach will be compared with recent absolute experimental measurements.
doi:10.1103/physreva.72.062708 fatcat:qgsjun7xlngwzgmbjld5uhln2i