ANALYSIS OF ELECTRONIC CORRELATIONS IN LARGE-ANGULAR-MOMENTUM STATES USING THE COULOMB GREENS-FUNCTION - POSITIONS OF LOW DOUBLY-EXCITED STATES IN ALKALINE-EARTH ATOMS

The position of atomic states with an outer electron of large angular momentum l are analysed using a Sturmian expansion of the Coulomb Gree n's function. The method is applied here to low doubly excited states of alkaline-earth atoms, namely 3d(j)ng in Ca, 4d(j)ng in Sr and 5d(j) ng in Pa. The figures turn out to be as accurate as those from R-matri x theory and may be even better, for example, in strontium. A critical discussion of measured positions is given, completing previously unce rtain assignments. New positions for large n are tabulated as well as for previously unreported total angular momentum values. Local series interactions can be analysed and are shown to be weak between two seri es with an outer g electron.