Excitation and charge transfer inp+H(2s)collisions

Abstract

Excitation and charge transfer cross sections for proton collisions with $2s$ excited state hydrogen are calculated using time-dependent lattice, atomic-orbital close-coupling with pseudostates, and classical trajectory Monte Carlo methods. The time-dependent lattice calculation yields $\ensuremath{\Delta}n=1$ excitation and $\ensuremath{\Delta}n=0$ and $\ensuremath{\Delta}n=1$ charge transfer cross sections at 5, 10, and $15\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ incident energy. The atomic-orbital close-coupling with pseudostates calculation yields excitation cross sections to $n=3--5$ and charge transfer cross sections to $n=1--5$ at a number of incident energies between 1 and $100\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$. The time-dependent lattice and close-coupling pseudostates calculations are found to be in good agreement with previous standard close-coupling results. The close-coupling with pseudostates calculations are used to benchmark the classical trajectory Monte Carlo calculations, which are widely used in astrophysical and laboratory plasma modelling.