Production cross sections of recoil Ar ions in coincidence with final charge states of 2 MeV C3+ projectiles

We have measured absolute cross sections of multiple ionization in coincidence with final charge states of projectiles for collisions of C3+ ions with Ar atoms at 2 MeV. At this collision energy, the recoil ions with low charge states were mainly produced by pure ionization while capture and loss ionization were important processes for the production of recoil ions with higher charge states. In an analysis of the data, an independent-electron model was applied. The results indicate that the ionization probability of the target electron depends on the impact parameter in ionization processes, such as pure-, capture-, and loss-ionization. The obtained values were compared with calculations by a classical-trajectory Monte Carlo (nCTMC). The experimental cross sections are in good agreement with the calculated values for pure, single-capture and single-loss ionization. (author)