J. Phys. IV France 10 (2000) Pr5-489-Pr5-492
Classical evaluation of low energy collision cross sectionsK. Katsonis1, G. Maynard1, K. Tu1 and F. Brouillard2
1 Laboratoire de Physique des Gaz et des Plasmas, UMR 078 du CNRS, Université Paris-Sud XI, 91405 Orsay cedex, France
2 Laboratoire de Physique Atomique et Moléculaire, FYAM, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
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 (Aq+, 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.
© EDP Sciences 2000