We apply an independent electron model to study q-fold target-charge-state production in 25-600 keV/nucleon B 2+-Ne collisions for which experimental and theoretical results were published recently [W. Wolff et al.,Phys. Rev. A 84, 042704 (2011)]. The model treats projectile and target electrons using a common potential and makes use of a single-determinant wave function for the combined system. The calculated total cross sections for positive recoil ion production as well as for Ne q+ production (q = 1,. .. ,4) determined in coincidence with an unchanged projectile charge state agree well with experiment where available, i.e., in the 30-400 keV/nucleon energy range. At energies below 200 keV/nucleon the projectile electrons are shown to play a crucial role in reproducing the experimental data for q = 1,. .. ,4. For the q 2 channels the inclusion of projectile electron contributions is needed even at energies above 200 keV/nucleon in order to reproduce the experimental data. As expected, the predictions for the q = 5 recoil charge state overestimate the experimental data due to a failure of the independent electron model for this extreme channel.
Multiple electron loss of fast Ar6+ (10.2 MeV amu−1) and Ar8+ (19 MeV amu−1) ions in collisions with neutral helium and argon target atoms is analysed in the independent particle model. It is found that losses from inner shells are significant such that subsequent Auger electron emission processes cannot be neglected. The Auger processes are taken into account on the level of a statistical model introduced recently. Total cross sections for multiple electron loss are calculated and compared with experimental data. In particular, ratios of q-fold to single ionization are described well.
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