Bare-Nucleus Matrix

We first consider the symmetric one-electron operator T, which is the sum of operators U, i = 0, N, for each electron. A useful example of t, is the bare nucleus Hamiltonian X, -I- Vi, where T, is the electron—nucleus potential. The second-quantised form for T is found by considering matrix elements for [N + l)-electron determinants p ), p) of orbitals selected... 

The order of perturbation theory in which each block contributes to the correlation energy is indicated. The structure of the Hamiltonian matrix when the single determinantal reference function is constructed from bare nucleus orbitals is displayed in Table 13, where again the order of perturbation theory in... 

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