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 2 s 2 p 2 and 2 p 3 configurations of Be − the p 3 configurations of C − , Si − , Ge − , Sn − and Pb − the s 2 p and sp 2 configurations of Mg − , Ca − , Sr − , Ba − and Ra − and the s 2 p and sp 2 configurations of Zn − , Cd − and Hg − are reported here and compared, when possible, with earlier theoretical and experimental results.