Abstract
The target dependence of equilibrium charge-state distributions was studied for medium-energy (50--500-keV/u) hydrogen and boron emerging from solids. Using a backscattering method, charge fractions were measured for various elemental solid substances with atomically clean surfaces in a pressure range of ${10}^{\mathrm{\ensuremath{-}}8}$ Pa. The respective charge fractions of hydrogen and boron are found to oscillate with target atomic number ${\mathit{Z}}_{\mathit{t}}$, reflecting the periodic electron shell structures of the target atoms. Comparison between the ${\mathit{Z}}_{\mathit{t}}$ oscillations of hydrogen and boron revealed that the oscillatory behavior depends on the final bound state of the captured electrons. This oscillatory behavior can reasonably be explained by the Oppenheimer-Brinkman-Kramers approximation.
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