Theoretical investigation of energy levels and transition data for P II^⋆

¹ Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio av. 3, 10222 Vilnius, Lithuania
e-mail: pavel.rynkun@tfai.vu.lt
² Group for Materials Science and Applied Mathematics, Malmö University, 20506 Malmö, Sweden

Received: 21 November 2018
Accepted: 2 January 2019

Abstract

Aims. The main goal of this paper is to present accurate and extensive transition data for the P II ion. These data are useful in various astrophysical applications.

Methods. The multiconfiguration Dirac–Hartree–Fock (MCDHF) and relativistic configuration interaction (RCI) methods, which are implemented in the general-purpose relativistic atomic structure package GRASP2K, were used in the present work. In the RCI calculations the transverse-photon (Breit) interaction, the vacuum polarization, and the self-energy corrections were included.

Results. Energy spectra are presented for 48 even states of the 3s²3p², 3s²3p{4p, 4f, 5p, 5f, 6p}, 3s3p²3d configurations, and for 58 odd states of the 3s3p³, 3s²3p{3d, 4s, 4d, 5s, 5d, 6s} configurations in the P II ion. Electric dipole (E1) transition data are computed between these states along with the corresponding lifetimes. The average uncertainty of the computed transition energies is between five and ten times smaller than the uncertainties from previous calculations. The computed lifetimes for the 3s²3p4s³P^o states are within the error bars of the most current experimental values.