Electron capture from atomic hydrogen into excitedn,llevels of projectiles withZ1≥1

Abstract

Calculations are presented of cross sections for electron capture from atomic hydrogen to $n$, $l$ excited states of $p^{+}$, ${\alpha }^{++}$, and ${\mathrm{Be}}^{+4\mathrm{}}$ at velocities of about 100 keV/amu using both the Brinkman-Kramers (BK) and Jackson-Schiff (JS) approximations, and to excited states of ${\mathrm{O}}^{+8\mathrm{}}$ in the BK approximation. Capture occurs into levels with increasing $n$ and $l$ as the projectile charge $Z_1$ is increased. While the BK and JS ratios $\frac{{\sigma }_{\mathrm{nl}}}{{\Sigma }_{n,l}{\sigma }_{\mathrm{nl}}}$ are quite similar for $p$+H, these two approximations give rather different distributions in $n$ and $l$ for ${\mathrm{Be}}^{+4\mathrm{}}$ where transfer to excited levels dominates.