Relativistic atomic structure calculations and electron impact excitations of Fe23+

- Energies, oscillator strengths, and radiative rates have been calculated of Li-like iron using the MCDF method.
- The relativistic effects, high-lying levels correlations, and QED effects have been applied.
- The excitation rate coefficients by electron impact are calculated at different electron temperatures.

Relativistic calculations using the multiconfiguration Dirac-Fock method for energy levels, oscillator strengths, and electronic dipole transition probabilities of Li-like iron (Fe23+) are presented. A configuration state list with the quantum numbers nl, where n=2-7 and l=s,p,d,f,g,h,i has been considered. Excitations up to three electrons and correlation contributions from higher orbitals up to 7l have been included. Contributions from core levels have been taken into account, EOL (extended optimal level) type calculations have been applied, and doubly excited levels are considered. The calculations have been executed by using the fully relativistic atomic structure package GRASP2K. The present calculations have been compared with the available experimental and theoretical sources, the comparisons show a good agreement between the present results of energy levels and oscillator strengths with the literature. In the second part of the present study, the atomic data (energy levels, and radiative parameters) have been used to calculate the excitation and deexcitation rates of allowed transitions by electron impact, as well as the population densities of some excited levels at different electron temperatures.