Calculated wavelengths, oscillator strengths, and energy levels for allowed n = 2–3 transitions in Be-like ions O V to Ni XXV

Abstract

Calculated weighted oscillator strengths (O V to Ni XXV), wavelengths (Mg IX to Ni XXV), and energy levels (S XIII to Ni XXV) are listed for n = 2–3 transitions in ions belonging to the Be-like isoelectronic sequence along with available measured wavelengths (Mg IX to Ni XXV). They were computed with the aid of a Hartree-Fock-Relativistic computer program package which employs the Blume-Watson method for spin-orbit integrals. Configuration interaction was taken into account between the 2 s 2, 2 p 2, 2 s3 s, 2 s3 d, and 2 p3 p even configurations and the 2 s2 p, 2 s3 p, 2 p3 s, and 2 p3 d odd configurations. Ab initio values of Slater radial energy integrals were adjusted on the basis ofempirical data.