Hydrogen Charge Fractions from Collisions ofHon He

Abstract
We report measurements of hydrogen charge fractions following the collision of H on He. Incident energy is varied from 0.47 to 20 keV. The charge fractions were measured at scattering angles of 0.3° to 5°. A large neutral charge fraction is found at all energies and angles. At high energies, the elastic channel has a simple velocity dependence. We propose a simple model for this elastic channel.