Fine-structure energy levels and radiative decay rates in Al-like vanadium

Large-scale calculations of excitation energies from ground state for 97 fine-structure levels as well as of oscillator strengths and radiative decay rates for all electric-dipole-allowed and intercombination transitions among the (1s(2)2s(2)2p(6))3s(2)3p((2)P(0)), 3s3p(2)((2)S, (2)P, (2)D, (4)P), 3s(2)3d((2)D), 3p(3)((4)S(0),(2)P(0),(2)D(0)), 3s3p((3)P(0))3d((2)P(0),(2)D(0),(2)F(0),(4)P(0),(4)D(0),(4)F(0)), 3s3p((1)P(0))3d((2)P(0),(2)D(0),(2)F(0)),3p(2)((1)S)3d((2)D), 3p(2)((1)D)3d((2)S, (2)P, (2)D, (2)F, (2)G), 3p(2)((3)P)3d((2)P, (2)D, (2)F, (4)P, (4)D, (4)F), 3s3d(2)((2)S, (2)P, (2)D, (2)F, (2)G, (4)P, (4)F), 3s(2)4s((2)S), 3s(2)4p((2)P(0)), 3s(2)4d((2)D), 3s(2)4f((2)F(0)), 3s3p((3)P(0))4s((2)P(0),(4)P(0)) and 3s3p((1)P(0))4s((2)P(0)) states of V XI are performed using extensive configuration-interaction (CI) wavefunctions. The calculations used the CIV3 computer code of Hibbert. The important relativistic effects in intermediate coupling are incorporated by means of the Breit-Pauli Hamiltonian. In order to keep our calculated energy splittings as close as possible to the National Institute of Standard and Technology (NIST) values, we have made small adjustments to the diagonal elements of the Hamiltonian matrices. Our calculated excitation energies, including their ordering, are in excellent agreement with the available NIST results. From our radiative decay rates, we have also calculated radiative lifetimes of some fine-structure levels. Generally, very good agreement between our calculated lifetimes and those from sophisticated calculation is realized for many fine-structure levels. However, a few significant differences are noted and discussed.