The contribution of the saddle point mechanism to the total ionization cross section in slow atomic collisions

14 June 1991

journal article
Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics

Vol. 24 (11) , 2699-2718
https://doi.org/10.1088/0953-4075/24/11/012

Abstract

Approximation analytic expressions for the total ionization cross section for H⁺-H and He²⁺-H collisions are obtained within the framework of the theory of non-adiabatic transitions in slow atomic collisions. Theoretical predictions for the cross section of the saddle point mechanism are presented. It is shown that this ionization channel contributes significantly to the total ionization. For both collision systems the calculated total ionization cross section agrees well with experimental data obtained by Shah et al. (1987).

Keywords

This publication has 21 references indexed in Scilit:

Quasiclassical expression for parameters which determine nonadiabatic transitions in aZ1eZ2basis
Physical Review A, 1990
Charge exchange, excitation, and ionization via hidden avoided crossings
Physical Review A, 1990
Saddle-point electrons in proton-impact ionization of H: A classical trajectory study
Physical Review A, 1990
Calculation of partial electron-transfer cross sections in 1–84-keV/amu ${He}^{2 +}$ +H collisions
Physical Review A, 1988
Saddle-point electrons in ionizing ion-atom collisions
Physical Review Letters, 1987
v/2 electrons in $H^{+}$ +H ionizing collisions
Physical Review A, 1986
Coupled-state calculations for excitation, charge transfer, and ionization in 1-75-keV proton-hydrogen-atom collisions
Physical Review A, 1983
Ion-atom differential cross sections at intermediate energies
Physical Review A, 1983
Excitation and charge transfer to $2 s$ and $2 p$ states in 1 — 20-keV $H^{+}$ -H collisions
Physical Review A, 1982
Charge transfer for He²⁺on H using molecular bases with plane wave translational factors
Journal of Physics B: Atomic and Molecular Physics, 1979