State-selective electron capture by Krq+ions from rare-gas atoms

Abstract

Single electron capture into selected states has been studied by means of translational energy spectroscopy for collisions of multiply charged Krq+ ions (q=2, 3 and 4) with rare-gas atoms, at collisions energies of 3q keV, with an energy resolution of 0.3q eV. The measurements show that as the atomic number Z of the target increases, i.e. as its ionisation potential decreases, electron capture into higher excited states of the projectile product ion become more important. State-selective single electron capture cross sections are measured for Kr4+ ion colliding with He and Ne in the collision energy range from 8 to 24 keV by means of translational energy gain spectroscopy. The single electron capture cross sections in collisions of 3q keV Krq+ (2<or=q<or=6) with He are found to be oscillating functions of q.