State-selective single- and double-electron capture by Ar4+ and Ar5+ ions from rare-gas atoms

Abstract

Single- and double-electron capture into selected states has been measured by means of translational energy spectroscopy for collisions of multiply charged Ar4+ and Ar5+ ions with He, Ne, Ar and Kr at collision energies of q*3 keV, where q is the ion charge state. In all the collision systems studied, the dominant reaction channels are due to capture into the excited states of the projectile product. Contributions due to capture accompanied by target excitation and transfer ionisation are also detected. The collisional energy gain spectra for single-electron capture processes are interpreted qualitatively in terms of the reaction windows, which are calculated using a multichannel Landau-Zener model.