L-Shell Photoionization of Magnesium-like Ions with New Results for Cl5+

This study reports on the absolute photoionization cross sections for magnesium-like Cl5+ ion over 190–370 eV photon energy range, corresponding to L-shell (2s and 2p subshells) excitation regime. The experiments were performed using Multi-Analysis Ion Apparatus (MAIA) PLéIADES beamline at SOLEIL synchrotron radiation storage ring facility. Single double ionization yields, produced by of subshell from 2p63s2 1S0 ground state 2p63s3p 3P0,1,2 metastable levels, observed, as well 2s excitations. Theoretical calculations Multi-Configuration Dirac-Fock R-matrix approaches carried out, results compared with experimental data. examined within overall evolution early members Mg-like isoelectronic sequence (Mg, Al+, Si2+, S4+, Cl5+). Characteristic energies P3+ estimated interpolation.