State-Selective Single-Electron Capture by Ne$^{q+}$ (q = 3 -- 5) Ions from CO$_{2}$

Energy-gain spectra and absolute total cross sections have been measured for single-electron capture processes in collisions of Ne$^{q+}$ recoil ions with CO$_{2}$ at laboratory impact energies between 25 and 300 qeV (q = 3 - 5, where q is the projectile charge state) and scattering angles between 0\r{ } and 5\r{ } using translational energy-gain spectroscopy technique. The energy-gain spectra show that only a few final states were selectively populated depending on the charge state of the projectile. In all collision systems studied here, the dominant reaction channels are due to non-dissociative single-electron capture into excited states of the projectile product. The final state populations will be discussed on the basis of the reaction windows, which are calculated using the single-crossing Landau-Zener model and the extended version of the classical over-the-barrier model. Further measurements of total cross sections for single-electron capture will also be presented and compared with theoretical calculations based on the multi-channel Landau-Zener (MCLZ) model.