A&A 486, 1053-1067 (2008)
Energy levels, radiative rates, and excitation rates for transitions in O IVK. M. Aggarwal and F. P. Keenan
Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, Northern Ireland, UK
Received 26 September 2007 / Accepted 25 May 2008
Aims. In this paper we report calculations for energy levels, radiative rates, and excitation rates for transitions in O IV.
Methods. The GRASP (general-purpose relativistic atomic structure package) and FAC (flexible atomic code) were adopted for calculating energy levels and radiative rates, and the Dirac atomic R-matrix code (DARC) used to determine the excitation rates.
Results. Oscillator strengths and radiative rates are reported for all E1, E2, M1, and M2 transitions among the lowest 75 levels of O IV. Additionally, lifetimes are reported for all levels and comparisons made with those available in the literature. Finally, effective collision strengths are reported for all transitions over a wide temperature range below 106 K. Comparisons are made with earlier results and the accuracy of the data is assessed.
Key words: atomic data -- atomic processes
© ESO 2008