The theory of atomic structure developed in the two preceding papers which treats electron correlation accurately in excited as well as ground states is applied to the evaluation of multiplet absorption oscillator strengths for a number of transitions of the type of $1s^{2}2s^{2}2p^n\to 1s^{2}2s2p^{n+1\mathrm{}}$ in CII, NI, NII, NIII, OII, OIII, OIV, FII, NeII, and NaIII. Those types of correlation effects necessary to obtain accurate oscillator strengths are clearly indicated by the theory. The usual improvement on the Restricted Hartree-Fock (RHF) calculation, the mixing of those few configurations nearly degenerate with the RHF configuration, is by itself incapable of bringing the oscillator strengths into agreement with experimental values. All the nondynamical correlation effects given in the first paper of this series must be considered. Very detailed wave functions which contain those important nondynamical correlations were obtained in that paper and here are used to compute oscillator strengths. The results are compared extensively with recent experiments. The calculated values are usually in very good agreement with experimental data. Many more transitions for which no experimental results are yet available are also tabulated here.

• Received 20 February 1969

DOI:https://doi.org/10.1103/PhysRev.183.56