Analytical Schwartz density applied to heavy two-electron ions

An analytical expression of the electron density function rho(r) due to Schwartz for two-electron atomic systems is applied to a detailed study of density-dependent properties of relatively heavy two-electron ions. Comparison of the Schwartz results with those from accurate Hartroe-Fock and Hylleraas wave functions shows that despite its simple yet analytical form, the Schwartz density has a quantitative applicability in the density study of two-electron atoms within the nonrelativistic framework. (C) 1997 John Wiley & Sons, Inc.