Electron transfer into then=3states of hydrogen by proton impact on gases

Abstract

Absolute cross sections for electron transfer into the $3p$ and $3d$ states of hydrogen have been measured for 2.2-to 8.2-keV proton impact on He, Ar, Kr, ${\mathrm{O}}_2$, ${\mathrm{H}}_2$, and ${\mathrm{N}}_2$. An apparent maximum occurs in the $3d$ cross section for both Ar and ${\mathrm{H}}_2$. Balmer-alpha cross sections are synthesized from these results and previously reported $3s$ cross sections.