ملخص: The resonant charge exchange in the incoming path of alkali ions scattered at low energy from a polycrystalline nickel surface is studied by using the image e.ect occurring at glancing incidence (2–10
from the surface plane) and for specular re.ection. The part of the experimental artefacts (geometrical factor, surface roughness. . .) is extracted from the re.ection coe.cient of almost completely neutralised projectiles (He? or Ne?) compared with the coe.cient obtained from numerical simulations (TRIM and MARLOWE codes). The present model explains very well the lowering of the re.ection coe.cient measured at grazing incidence (below 4
). Furthermore, the optimised values of the charge fraction in the incoming path and the image potential are in agreement with the theoretical calculations in the case of Na?/Ni at 4 keV.

لغة: إنجليزية