Exact integral constraint requiring only the ground-state electron density as input on the exchange-correlation force <tex>$-\partial V_{xc}(r)/\partial r$</tex> for spherical atomsExact integral constraint requiring only the ground-state electron density as input on the exchange-correlation force <tex>$-\partial V_{xc}(r)/\partial r$</tex> for spherical atoms
Faculty of Sciences. Physics

Department of Physics

article

2008New York, N.Y., 2008

Physics

The journal of chemical physics. - New York, N.Y.

129(2008):19, p. 194114,1-194114,4

0021-9606

000261141300014

E

English (eng)

University of Antwerp

Following some studies of n(r)V(r)dr by earlier workers for the density functional theory (DFT) one-body potential V(r) generating the exact ground-state density, we consider here the special case of spherical atoms. The starting point is the differential virial theorem, which is used, as well as the HillerSucherFeinberg [Phys. Rev. A 18, 2399 (1978)] identity to show that the scalar quantity paralleling the above vector integral, namely, n(r)V(r)/rdr, is determined solely by the electron density n(0) at the nucleus for the s-like atoms He and Be. The force −V/r is then related to the derivative of the exchange-correlation potential Vxc(r) by terms involving only the external potential in addition to n(r). The resulting integral constraint should allow some test of the quality of currently used forms of Vxc(r). The article concludes with results from the differential virial theorem and the HillerSucherFeinberg identity for the exact many-electron theory of spherical atoms, as well as for the DFT for atoms such as Ne with a closed p shell.

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