Abstract
Numerical evaluations of ion - hydrogen atom collision's ionization cross sections with the Classical Trajectory Monte Carlo (CTMC) method are shown here to be valid in the keV energy region. Careful numerical integration of the Coulomb Three-Body (CTB) system's (A q+ , p + , e - ) classical trajectories is correctly assessing the « saddle electron » dynamics in the 1 to 10 keV energy region. Resulting ionization cross sections are comparable to those recently obtained experimentally, although they are still lower for the higher energies. Consequently, the method has be extended to calculate low energy hydrogen - hydrogen collision ionization processes, which have been measured recently.
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