Abstract
We present double-differential electron distributions, measured in the neighborhood of the velocity of the emerging projectiles, for 45-keV H${}^{+}$ and H${}^{0}$ incident on a He target. Target thicknesses range from single-collision conditions through a multiple-collision regime up to charge equilibrium in the emerging beam. The convoy-electron emission yield is determined as a function of target thickness. Using a simple rate equation and known cross sections for charge exchange and electron scattering, approximate agreement with experiment is obtained. A smaller electron-He scattering cross section improves this agreement. This result could be interpreted as due to the effect of the projectile Coulomb field in the transport of the electrons.
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