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Electron capture into N4+(1s2nl) subshells during N5+-Li collisions at 40-120 keV

We have recorded photon spectra during collisions between N5+ ions and lithium atoms in the range 200-600 nm at different projectile energies (40-120 keV). The spectral resolution allowed the determination of capture cross sections of nl subshells with principal quantum numbers n=6, 7 and 8. The experimental results are compared to calculations using the three-body classical trajectory Monte Carlo method (CTMC). On the whole, a good agreement between experimental and CTMC calculated results is obtained. The influence of the projectile core electrons is examined comparing CTMC calculations for the B5+-Li collision system to those for N5+-Li. A small but not negligible core-electron effect is observed which manifests itself mainly in the population of the N4+(ns) subshells.