Energy levels and transition properties for As-like ions Se II, Br III, Kr IV, Rb V, and Sr VI

Abstract

In this theoretical study, we aim to investigate atomic properties of As-like ions: Se II, Br III, Kr IV, Rb V, and Sr VI. The multiconfiguration Dirac–Hartree–Fock (MCDHF) and relativistic configuration interaction (RCI) methods, which are implemented in the general-purpose relativistic atomic structure package GRASP2018, are used in the present work. In the RCI calculations the transverse-photon (Breit) interaction, the vacuum polarization, and the self-energy corrections are included. By employing MCDHF method, we computed the lowest energy levels of the 4s4p4, 4s24p2{4d,5d,5s,6s} even and of the 4s24p3, 4s24p2{5p,6p,4f}, 4s4p34d odd configurations. Accuracy of energy levels is​ evaluated by comparing it with the National Institute of Standards and Technology Atomic Spectra Database (NIST ASD or database) recommended values and with experimental and theoretical methods. We obtain the average accuracy in the energy level compared with the NIST database: 0.6%, 1.7%, 0.4%, 0.9% and 0.7% for Se II, Br III, Kr IV, Rb V, and Sr VI, respectively. We calculated properties of electric dipole (E1), magnetic dipole (M1), and electric quadrupole (E2) type transitions and investigated its accuracy. We evaluated the accuracy of data, using combination of new methodology, presented in recent works. Majority (77%, 93%, 95%, 97%, and 97% for Se II–Sr VI) of our computed transition properties belongs to D or better accuracy class.