LS-term dependence of Slater integrals in pnp' configurations. III. Deviations from the single-configuration approximation in the 2p⁴3p configurations

For pt.II, see ibid., vol.6, 1751, (1973). It is shown that a Hartree-Fock calculation of the mean energy of the 2p 4 3p configurations in the F I isoelectronic sequence is able to predict accurately the structure of the configurations with the exception of three terms (( 1 D) 2 P, ( 3 P) 2 P and ( 3 P) 4 P), for which the deviations correspond to Hartree-Fock wavefunctions appreciably different both from one another and from that obtained for the mean energy. This knowledge is used to improve the parametric fitting of the configurations.