ANALYSIS OF DYNAMICAL AND NONDYNAMIC COMPONENTS OF ELECTRON CORRELATION-ENERGY BY MEANS OF LOCAL-SCALING DENSITY-FUNCTIONAL THEORY

The partitioning of electron correlation energy into dynamical and non dynamical components is examined in the context of the local-scaling t ransformation version of density-functional theory and its connection with the Hohenberg-Kohn-Sham density-functional-theory definition of e lectron correlation is discussed. The relative importance of these com ponents is analyzed with reference to the helium atom and its isoelect ronic series. The present results attest to the preponderantly dynamic al character of the recovered correlation energy. (C) 1997 American In stitute of Physics.