Outer s-shell ionization of neon, argon and krypton by N+, Ne+and Ne2+impact

The outer s-shell ionization of neon, argon and krypton has been studied by N + and Ne + impact in the energy range of 100 keV to 1000 keV, and by Ne 2+ on Ne from 300 keV to 1800 keV. For the Ne + -Ne system the 2s vacancy production has been studied for the projectile and target separately. In connection with theoretical calculations of Albat et al. (see ibid., vol.8, p.2520 (1975)), the Ne + -Ne measurements allow the statement that the quasi-molecule model holds for this process up to relative velocities of 0.7 au.