State selective single-electron capture in O6+ + Na collisions

Single-electron capture in O6+ + Na collisions at 1-9 keV/amu collision energy has been studied both experimentally and theoretically. Partial cross sections for electron capture into n = 5, 6, 7, 8 and n ≥ 9 have been obtained from target recoil momenta measured by the technique of MOTRIMS and are compared with close-coupling results obtained from a two-centre extension of the basis generator method. An overall good agreement is found, concerning the relative magnitude as well as the energy dependence. Also the contribution of ionization could be extracted from the recoil spectra. The ionization cross section is very small but strongly increases with energy