Abstract
The multireference many-body perturbation theory (MBPT) method is presented pedagogically. The distinctions between complete and incomplete model spaces are discussed. All second- and third-order diagrams for the diagonal and off-diagonal elements of the effective Hamiltonian matrix are presented in a compact form for complete and incomplete model spaces, including a new treatment of the renormalization diagrams. Illustrative numerical results are presented for the excitation energies of C2H4 using an incomplete single excitation model space, and for a study of FH potential energy surfaces with several different sizes of reference space.
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