Electron correlation in momentum space for the neon-atom isoelectronic sequence from F- through Ar8+

Abstract

Accurate momentum-space properties for the neon-atom isoelectronic sequence from ${\mathrm{F}}^{\mathrm{\ensuremath{-}}}$ through ${\mathrm{Ar}}^{8+}$ are calculated from highly accurate configuration-interaction wave functions that were constructed according to a density convergence criteria. These results should provide a benchmark to which calculations of momentum-space properties derived from other methods may be compared. Our results show that the inclusion of electron correlation has a smaller effect on these properties for the Ne sequence than on other isoelectronic sequences. The entropy sum is observed to increase with the inclusion of electron correlation which further substantiates the claim of its use as a measure of basis set or density quality. \textcopyright{} 1996 The American Physical Society.