title: Density per particle as a descriptor of Coulombic systems.
abstract: It is shown that for finite Coulombic systems the density per particle, final sigma identical with rho/N, determines the value of any observable quantity. The associated variational principle is derived.
authors.affiliation: Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290.
authors.forename: P W
authors.initials: PW
authors.lastname: Ayers