SIMPLE ESTIMATES OF ATOMIC NEGATIVE-ION STRUCTURES

Ab initio calculation of electron affinities and level structures have been obtained by adding a simple approximate correlation-potential term to the usual pseudo-relativistic Hartree-Fock Hamiltonian. Results for the following systems the 2s2p2 and 2p3 configurations of Be-, the p3 configurations of C-, Si-, Ge-, Sn- and Pb-, the s2p and sp2 configurations of Mg-, Ca-, Sr-, Ba- and Ra-, and the s2p and sp2 configurations of Zn-, Cd- and Hg- are reported here and compared, when possible, with earlier theoretical and experimental results.