Electron-impact ionization for Ne3+ and Ne4+

Ionization cross sections are studied for energy levels of the ground configurations of the Ne${}^{3+}$ and Ne${}^{4+}$ ions. The distorted wave (DW) approximation is used to analyze experimental data. The scaled DW cross sections are used to explain measurements for the Ne${}^{3+}$ ion. Study includes analysis of contributions from the direct and indirect ionization processes. Convergences of excitation-autoionization (EA) channels are estimated by analyzing excitations up to shells with the principal quantum number $n⩽20$. This study shows that the EA process provides from $\sim$10% to 20% for the energy levels of the ground configurations of the Ne${}^{3+}$ and Ne${}^{4+}$ ions.