Oscillator strengths for KIII, CaIV and ScV

The method of superposition of configurations has been used to obtain accur ate oscillator strengths and transition probabilities for transitions betwe en the 3s(2)3p(5 2)P(o) ground state and the 3s3p(6), 3s(2)3p(4)3d and 3s(2 )3p(4)4s states of doubly-ionized potassium, triply-ionized calcium and fou r-times-ionized scandium. The CIV3 code was used to perform calculations bo th in LS coupling and in intermediate (or LSJ) coupling, using an extensive set of correlation configurations. The present results are believed to be the most accurate available and are compared with previous theoretical work .