Pair correlation functions for exchange and correlation in uniform spin densities

The correlation holes for densities of equal and opposite spin around a tes t electron are determined from the Schrodinger equation with proper boundar y conditions, The traditional 'exchange' term follows from the boundary con dition which respects a spacial exclusion principle for equal spins. The re sulting potential compares reasonably well with standard local density pote ntials and the approach is feasible for extensions towards non-local effect s. (C) 1999 Elsevier Science B.V. All rights reserved.