A method is proposed, based on the model of two-electron states, for formulating the atomic wave function in a multiconfiguration approximation in which we forego mandatory equality among the radial orbitals with identical sets of values for the principal and orbital quantum numbers. The three-configuration approximation is applied by this method to the two lowest configurations of four atomic species of lithium type on the basis of analytic hydrogen-like orbitals. Orbitals of the Fock self-consistent field are also used in the case of the lithium atom. Author
Trans. of Akademiya Nauk Litovskoi SSR, Vilna. Trudy. Seriya B, n2(5) p3-10 1956, by George E. Brady, Jr., and Stuart W. Kellogg.