Electron capture and loss to continuum from 200-keV/u H0 and He0 projectiles colliding with He and Ar targets.

Abstract

Electrons ejected in collisions with neutral hydrogen and helium projectiles (200 keV/u) into the forward direction are measured in coincidence with the charge-state-analyzed outgoing projectile (${\mathrm{H}}^{0}$, ${\mathrm{H}}^{+}$; ${\mathrm{He}}^{0}$, ${\mathrm{He}}^{+}$, ${\mathrm{He}}^{2+}$). All electron spectra, including those recorded in coincidence with ${\mathrm{H}}^{0}$ and ${\mathrm{He}}^{0}$ atoms, where the long-range Coulomb field is screened, show a cusplike structure. The data are compared with available theories for electron capture to the continuum.