Abstract
The energies of the levels of the configurations p2 and p4 are calculated, including the Hamiltonian terms arising from the interaction of the spin of .one electron with the orbit of another and the interaction of the spins of pairs of electrons. The spin interaction parameters and unperturbed energies of the levels are determined empirically from observational spectroscopic data. Comparisons are made with parameters computed from self-consistent field wave functions where available. Revised transition probabilities are computed for the forbidden lines within the configuration p2 for the ions C I, N II, O III, F IV and Ne V and within the configuration p4 for the ions O I, F II and Ne III.

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