Theoretical calculations and evaluation of atomic structure data for argon ions from F-like Ar to C-like Ar

Abstract This paper reports the calculated atomic structure data for F-like, O-, N-, and C-like Argon (Ar) ions. These ions play a crucial role in interpreting fundamental plasma spectroscopy and understanding the complex astrophysical spectra. The relativistic configuration interaction (RCI) and many-body perturbation theory (MBPT) methods implemented in the flexible atomic code (FAC) were used to calculate the energy levels of the assigned ions. Relativistic and correlation effects, as well as second-order correction of quantum electrodynamics (QED) effects, were considered in the calculations to provide accurate energy levels for the desired ions. The atomic structure data produced for the assigned argon ions reported in this paper are consistent with the available published data and the NIST database, with a few exceptions in the first levels above the ground state of some selected ions. The present calculations demonstrate a high degree of accuracy and yield significant atomic structure details, particularly for higher-order shells with n = 4 and n = 5, in the four Ar ions.