Guseinov, Israfil IsaMamedov, B. A.Ertuerk, M.Aksu, H.Sahin, E.2025-01-272025-01-2720070177-7963https://doi.org/10.1007/s00601-007-0179-1https://hdl.handle.net/20.500.12428/25151The applicability of a combined open-shell Hartree-Fock theory of atomic-molecular and nuclear systems to the states of a single configuration which has the arbitrary symmetry of open shells is explicitly demonstrated by calculations based on the combined Hartree-Fock-Roothaan equations for atoms. As examples of an application of the combined theory using single-zeta Slater-type basis sets, the calculations have been performed for the lowest states of the lowest and excited electronic configurations of carbon and nitrogen atoms containing one-, two- and three-open shells. For the case of single-open shells for carbon and nitrogen atoms, the double-zeta basis-set calculations are also presented. The results of computer calculations for the orbitals, kinetic and total energies, linear combination coefficients and virial ratios are given.eninfo:eu-repo/semantics/closedAccessOperator MethodStatesArticle413-421122010.1007/s00601-007-0179-1Q3WOS:0002516515000062-s2.0-37249028725Q3