Classical ionization and charge-transfer cross sections forH++ He andH+

Abstract

The three-body system is analyzed in relation to the calculation of atomic scattering cross sections. A method is presented to generate the initial electronic conditions for the classical-trajectory Monte Carlo method in the case where the active electron is subject to non-Coulomb interactions.The method is then applied to study the collisions of H+ with He and Li+ targets in the intermediate-to high-energy range. Single-electron capture and single-ionization total cross sections are presented for both collision systems. In the case of He targets, total cross sections for double ionization and singly differential cross sections for free-electron production are also calculated. Cross sections and initial electronic distributions are obtained with both Coulomb and model interactions and compared. Good agreement is found between theoretical and experimental results, except for the double ionization of He.

Electron production in proton collisions with atoms and molecules: energy distributions

“…After a sufficiently large ensemble of projectile-target configurations has been sampled, the differential cross sections are determined. Although there have been numerous classical-trajectory Monte Carlo calculations performed for various scattering processes, in the case of singly-differential cross sections for proton-impact ionization, the most complete calculations reported to date are for atomic hydrogen (Olson, 1983;Reinhold et al, 1987) and helium targets (Abrines and Percival, 1966;Reinhold and Falcon, 1986;Olson et al, 1987;Olson and Gay, 1988;Reinhold and Olson, 1989). …”

Ionization of small molecules induced byH+, He+, andKovács1, Herczku2, Juhász3 et al. 2016Phys. Rev. A

“…Our procedure for the generation of the initial values of the position and momentum coordinates of the electron from a set of uniformly distributed variables was different from that of Illescas et al [40]. In our work we followed the method suggested by Reinhold and Falcón [43] for non-Coulombic systems. The latter authors considered the problem of a central (isotropic) potential; we generalized their results for the nonisotropic potentials of the molecules.…”

Multiple ionization of rare gases by hydrogen-atom impact

“…For the generation of the initial values of the position and velocity coordinates of the electron from a set of uniformly distributed variables we applied the general procedure suggested by Reinhold and Falcón [26] for non-Coulombic systems.…”