Total cross sections for single ionization and charge transfer have been calculated using the classical-trajectory Monte Carlo (CTMC) technique for collisions of both positrons and protons with helium. Analysis of the classical trajectories has helped to explain the differences in the collision mechanisms responsible for the observed relative magnitudes of the positron and proton electron-removal cross sections. In the intermediate collision velocity range (1.5 a.u.
D. R. Schultz and R. E. Olson, "Single-electron Removal Processes In Collisions Of Positrons And Protons With Helium At Intermediate Velocities," Physical Review A, vol. 38, no. 4, pp. 1866 - 1876, American Physical Society, Jan 1988.
The definitive version is available at https://doi.org/10.1103/PhysRevA.38.1866
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01 Jan 1988