State-Selective Single-Electron Capture by Ne$^{q+}$ (q = 3 -- 6) Ions from H$_{2}$ O and CO$_{2}$

Using translational energy-gain spectroscopy technique, we have measured the energy-gain spectra and absolute total cross sections for single-electron capture in collisions of Ne$^{q+}$ recoil ions with H$_{2}$O and CO$_{2}$ at laboratory impact energies between 15 and 200 qeV (q = 3 - 6, where q is the projectile charge state) and scattering angles between 0\r{ } and 5\r{ }. The translational 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. Additional measurements of differential cross sections compared with available theoretical calculations will also be presented.