A frozen cores approximation for atomic structure calculations

Abstract

The coupled integro-differential equations for electron collisions with an N-electron ion may be solved at energies which give bound states for the (N+1)-electron system. Results are obtained for the ¹P⁰ series in C²⁺, including the configurations 1s²2snp, 1s²2pn's, 1s²2pn"d and 1s²2s2p. The 1s, 2s and 2p radial functions are calculated for C³⁺ and the np, n's and n"d radial functions are solutions of the coupled integro-differential equations.