Excitation Energies, Oscillator Strengths and Radiative Rates in Triply Ionised Phosphorous

Abstract

We have calculated the excitation energies for the lowest 23 LS and 43 fine-structure levels as well as oscillator strengths and radiative decay rates for the transitions among (1s22s22p6) 3s2 (1S), 3s3p (1,3Po), 3p2 (1S, 3P, 1D), 3s3d (1,3D), 3s4s (1,3S), 3p3d (1,3Po, 1,3Do, 1,3Fo), 3s4p (1,3Po), 3s4d (1,3D), 3s4f (1,3Fo) and 3p4s (1,3Po) states in P IV. These states are represented by extensive configuration-interaction (CI) wavefunctions obtained with the CIV3 computer code of Hibbert. The calculations have been carried out in both LS and intermediate-coupling schemes. Relativistic effects are included through the Breit-Pauli approximation via spin-orbit, spin-other-orbit, spin-spin, Darwin and mass correction terms. We have also calculated the radiative lifetimes from our radiative decay rates. Our results are compared with other theoretical calculations and the available experimental data.