The method of high-resolution Auger spectroscopy was used to study mechanisms for double-electron capture producing the projectile configurations ${3lnl}^{\prime }$ and ${4lnl}^{\prime }$ $(n>~4)$ in ${\mathrm{Ne}}^{10+}+\mathrm{He}$ collisions. Emphasis was given to slow collisions with projectile energies near 1 keV. At low collision energies the production of the configurations ${3lnl}^{\prime }$ $(n>~6)$ of nonequivalent electrons is found to become dominant. It is shown that dielectronic processes produced by the electron-electron interaction play a major role in the creation of the ${\mathrm{Ne}}^{8+}{(3\mathrm{lnl}}^{\prime })$ states.

• Received 19 August 1997

DOI:https://doi.org/10.1103/PhysRevA.57.3546