A NONLOCAL CORRELATION-ENERGY DENSITY-FUNCTIONAL FROM A COULOMB HOLE MODEL

A nonlocal correlation energy density functional based on the approxim ation of a model Coulomb hole is presented. The functional is construc ted to describe both the homogeneous electron gas and nonuniform syste ms. In the nonuniform case, the functional satisfies all uniform, as w ell as most nonuniform, coordinate-scaling constraints. The numerical results for the homogeneous electron gas and for atoms He through Ar c ompare favorably with those of other correlation functionals. (C) 1997 John Wiley & Sons, Inc.