Electron-impact excitation of Mg V and Si VII

Transition probabilities and effective collision strengths for electron-impart excitation are calculated for Mg V and Si VII ions. The calculations are performed in the close-coupling approximation using the B-spline Breit-Pauli R-matrix method. The multi-configuration Hartree-Fock method with term-dependant non-orthogonal orbitals is employed for an accurate description of the target wave functions. For each ion 86 fine-structure levels belonging to the 44 \textit{LS} states of 2s$^{2}$2$p^{4}$, 2s2$p^{5}$, 2$p^{6}$, 2$s$2$p^{3}$3$s$, 2$s$2$p^{3}$3$p$, and 2$s$2$p^{3}$3$d$ configurations are included in the close-coupling approximation; this leads to 3655 possible fine-structure transitions. The effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities. Our results are compared with previous theoretical results and available experimental data. Overall, we reached a good agreement with measured excitation energies and other calculated oscillator strengths. This work was supported by NASA grant NNX11AB62G from the Solar and Heliophysics Program.