LAUSR

Abstract Energy levels, weighted oscillator strengths and transition probabilities, lifetimes, hyperfine interaction constants, Lande gJ factors and isotope shifts have been calculated for all levels of 1 s 2 and 1 snl ( n = 2 - 8 , l ⩽ 7 ) configurations of He-like oxygen ion (O VII). The calculations were performed using the Multiconfigurational Dirac-Hartree-Fock (MCDHF) and the Relativistic Configuration Interaction (RCI) methods. A second set of calculations was obtained with the Many Body Perturbation Theory (MBPT) method. Transition probabilities are reported for all E 1 , E 2 , M 1 and M 2 transitions. Breit interactions and quantum electrodynamics effects were included in the RCI calculations. Comparisons have been made with the compiled data from the NIST ASD and other calculations and a good agreement was found which confirms the reliability of our results. The accuracy of the present calculations is high enough to facilitate identification of many observed spectral lines. For the first time, we present some missing data for the He-like oxygen ion.