Abstract
Configuration interaction wavefunctions for the 1s22s21Se, 1s22s2p 1,3P0; 1s22p2 3Pe, 1De, 1Se; 1s22s3s 1,3Se; 1s22s3p 1,3P0; 1s22s3d 1,3De states are calculated for C III, N IV, O V and Ne VII and are used to calculate oscillator strengths, both length and velocity forms, for transitions between these states. Some significant differences from previous calculations are obtained. Comparison with recent beam-foil experimental data is generally good.