Abstract
The probability density functions P(u) for the interelectronic distance u in the 23P and 21P states of the two-electron ions from He to Mg10+ are calculated from highly accurate explicitly correlated wavefunctions and also from self-consistent field wavefunctions of near Hartree-Fock quality. Effects of electron correlation on the P(u) densities ae examined with the help of their moments as well as Coulomb holes. Counter-intuitive effects such as an increase in interelectronic repulsion upon inclusion of electron correlation occur for helium and smoothly disappear as the atomic number increases.
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