An approach to electron correlation beyond the local spin density approximation

The authors derive an expression for E /sub xc/ (rho) which is entirely general and applies to any particle density and in particular to any degree of inhomogeneity. In the next section, the authors derive one-particle equations much along the lines of the paper by Kohn and Sham. Then the authors assume an approximate form for f /sub s,s/ (r'r) which conforms to the N-representability constraints and guarantees the correct image potential dependence at solid surfaces. In conclusion, it was shown that the one-particle equations provide a rigorous scheme for the calculation of ground state properties of N-electron systems