We report fully differential cross sections (FDCS) for the single ionization of helium by a 75 keV incident energy proton. Previous three-body distorted wave (3DW) 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 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.
M. Foster et al., "Precollision and Postcollision Electron-Electron Correlation Effects for Intermediate-Energy Proton-Impact Ionization of Helium," Physical Review A, American Physical Society (APS), Jan 2005.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.72.062708
Keywords and Phrases
Atom-Ion Collisions; Electron Correlations; Helium Neutral Atoms; Hydrogen Ions; Ionisation; Positive Ions
Article - Journal
© 2005 American Physical Society (APS), All rights reserved.