Electron loss and capture cross sections of 800 KeV amu −1 H and He species in carbon foils

Abstract

Transmitted charge fractions φ ij of incident 800 keV amu −1 projectiles through 1−8 μg cm −2 carbon foils have been measured for one-electron H 0, 3He + and H 2 + as well as two-electron H −, 3He 0 and H 3 +. For the thinnest targets (⪅3 μg cm −2), the transmitted fraction φ ij of the incident species can be characterized by an exponential decay with a coefficient of unity. This feature can be reasonably understood only if the incident projectile is transmitted with its original electron(s) intact. For the atomic projectiles, the charge changing cross sections σ ij ( i ≠ j) deduced from the φ ij are simulated well by the predictions based on binary collisions between a free projectile and target atoms.