Single-electron capture and ionization in He2++Na collisions at energies around the matching velocity (2–13 keV amu−1) have been studied both experimentally and theoretically. State-selective cross section for capture into the n = 2, 3, 4 and n ⩾ 5, and the ionization cross section as well as differential cross sections for capture into n = 3 and 4 were obtained by the MOTRIMS method and compared with CTMC calculations. Good agreement was found between experiment and CTMC, especially concerning capture into high n-shells (n = 4, n ⩾ 5) and the ionization cross sections. For capture into the subdominant n = 2 shell close coupling calculations show better agreement. The differential cross sections for capture into n = 3 and 4 show a different energy dependency.

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Single ionization cross sections for He 2+ and O 6+ impact on Na * (3p) in the 2-10 keV amu −1 energy range have been measured using recoil-ion momentum spectroscopy of cold Na atoms. The present results are compared with our previous data on Na(3s). It is found that ionization of these weakly bound alkali systems yields larger cross sections than predicted from scaling laws derived from H and He targets. Also information on the ejected electron momenta could be obtained from the recoil spectra.

Absolute electron capture cross sections of Kr + with Ar AIP Conf.Abstract. State selective single charge exchange n-level cross sections are calculated for collisions of Xe18+ and Xe54+ ions with Na(3s) and Na*(3p) over the energy range of 0.1 to 10.0 keV/amu. The CTMC method is used which includes all two-body interactions. Experimental state-selective cross sections and their corresponding transverse momentum spectra for Xe18+ are found to be in reasonable accord with the calculations.