Theoretical Studies of Allowed (E1) and Forbidden (E2 and M1) Transitions in La IV

B. Karaçoban Ustaa, S. Eserb aDepartment of Fundamental Science in Engineering, Sakarya University of Applied Science, 54187, Sakarya, Turkey bDepartment of Physics, Sakarya University, 54187, Sakarya, Turkey

Received: February 12, 2020; in final form April 3, 2020

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The energies and lifetimes for 5p6, 5p5nf (n=4-10), 5p5np (n=6-10), 5p5nh (n=6-10), 5p5nd (n=5-10), 5p5ns (n=6-10), 5p5ng (n=5-10), and 5p5ni (n=7-10) configurations and the transition parameters for allowed transition (electric dipole E1), and forbidden transitions (electric quadrupole E2, and magnetic dipole M1) are presented for triply ionized lanthanum (La IV, Z=57). The present results are obtained from a Hartree-Fock calculation with relativistic corrections and superposition of configurations (Cowan's HFR method) and general-purpose relativistic atomic structure package based on a fully relativistic multiconfiguration Dirac-Fock method. Comparisons are made with experimental and other available theoretical results to assess the reliability and accuracy of the present calculations. Moreover, some new wavelengths, oscillator strengths and transition probabilities of E1, E2, and M1 transitions have been obtained using these methods. These results are reported for the first time in this work.

DOI:10.12693/APhysPolA.137.1187 PACS numbers: 31.15.ag, 31.15.aj, 31.30.-i, 32.70.Cs