A large-scale R-matrix calculation for electron-impact excitation of the Ne${}^{2+}$ O-like ion

B. M. McLaughlin, Teck-Ghee Lee, J. A. Ludlow +4

The five J$\Pi$ levels within a $n{p}^2$ or $n{p}^4$ ground state complex provide an excellent testing ground for the comparison of theoretical line ratios with astrophysically observed…