Charge transfer and excitation in slow proton collisions with sodium

Abstract

The charge transfer and excitation cross sections for protons colliding with $\mathrm{Na}(3s)$ atoms are calculated in the incident energy region from $1.7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}5\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ by a quantum-mechanical molecular-orbital close-coupling (QMOCC) method and from $1\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}100\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ by a two-center atomic-orbital close-coupling method. The present QMOCC charge transfer cross section for low energy $(<40\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$ is in agreement with some other calculations, but disagrees with the experimental measurements [Z. Phys. A 313, 155, 1983]. For the higher energies, the cross sections calculated by the two methods are in harmony with the experimental and other theoretical data.