The computation of the Coulomb and exchange components J(u) and K(u), respectively, of the Hartree-Fock radial intracule density within the PRISM approach is discussed. Formulae are presented for the even-origin derivatives of these quantities and for the even-order moments of J(u). For molecular systems, we demonstrate that J(u) has, as expected, long-range nature comparable with the molecular extent but, in contrast, that K(u) is relatively short-range, with delocalisation effects providing additional structure and enhancing the range of the intracule.
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