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Energy Levels of Atomic Nitrogen Calculated in a Multiconfiguration Optimized Potential Model

The method of carrying out configuration interaction calculations using orbitals that are derived from a variationally optimized potential [K. Aashamar, T. M. Luke, J. D. Talman, J. Phys. B: Atom. Molec. Phys. 12, 3455 (1979), 14, 803 (1981)] is studied by applying it to the ground state and a considerable number of excited states of the nitrogen atom. The results of applying the method, using several correlation configurations, to the ground state multiplet are only slightly less satisfactory than the corresponding multiconfiguration Hartree-Fock results. It is shown furthermore that it is possible to obtain a unified description of a large number of excited states within the model using quite restricted configuration sets which are chosen in a reasonable way. Wavelengths and oscillator strengths for a large number of transitions are calculated and compared with experiment.