Two methods are presented for the calculation of interelectronic moments 〈un in position space and 〈vn in momentum space of atomic systems within the Hartree–Fock framework, where u and v are, respectively, the position and momentum distances of any pair of electrons. The methods are applied to the neutral atoms from He to Xe in their ground state, and the moments 〈un with n=−2 to +4 and 〈vn with n=−2 to +3 are reported based on the numerical Hartree–Fock calculations. Some trends of these interelectronic moments are also discussed as a function of atomic number.

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