Classical trajectory calculations for H⁺-H collisions with the Wigner function as initial phase space distribution

Abstract

For classical trajectory Monte-Carlo calculations the authors propose the use of the Wigner function for the initial distribution of the coordinates and momenta of the electron instead of the microcanonical phase space distribution. For physical reasons they restrict the Wigner function in energy space. The allowed energy interval is determined by a cut-off parameter Emax which is fitted to the experimental data. The calculated total cross sections for ionisation and charge transfer in H+-H collisions reproduce the experimental data in the range of incident proton energies Elab=25-200 keV. In addition they present the probabilities of ionisation and charge transfer as functions of the impact parameter and angular distributions of the ionised electron.