Light Ions of Astrophysical Interest-Radiative Transition Probabilities for C III, N IV, O V AND Ne VII

Multiconfiguration calculations of energy levels and bound–bound radiative transition probabilities for four astrophysically important ions of the Be isoelectronic sequence are presented. Convergence of the results with respect to the number of configurations included in the expansion is discussed. Results are presented for all ions from models with II and 16 configurations; including transition probabilities for 24 allowed electric dipole transitions. Some significant differences with previous calculations are obtained. The theoretical lifetimes are generally in good accord with those obtained by the beam-foil technique, and the results of other ab initio calculations.