Atomic structure calculations of triply ionized lanthanum (La IV)

Keywords: MCHF method, HFR method, energy levels, Landé g-factors, allowed transitions, forbidden transitions, wavelengths, oscillator strengths, transition probabilities In this study, the allowed and forbidden transitions of triply ionized lanthanum (La IV, Z = 57) were investigated using the multiconfiguration Hartree-Fock (Multiconfiguration Hartree-Fock–MCHF) and relativistic Hartree-Fock (Relativistic Hartree-Fock–HFR) methods. The relativistic energies and Landé g-factors for 5p6, 5p5nf (n = 4, 5), 5p5ns (n = 6, 7, 8), 5p5np (n = 6, 7), and 5p5nd (n = 5, 6) configurations and the transition parameters, such as wavelengths, oscillator strengths, and transition probabilities (or rates), for the electric dipole (E1), electric quadrupole (E2) and, magnetic dipole (M1) transitions between these levels were calculated for La IV. In the first chapter, previous works on La IV were given. The second chapter deals with the multiconfiguration Hartree-Fock and the relativistic Hartree-Fock methods. The results obtained using the MCHF atomic structure package and the Cowan's program package were compared with other works in the last chapter. Good agreement was found between our results and other available studies.