Abstract
A derivation of a zeroth-order Hamiltonian for use in multiconfigurational perturbation theories is presented. This derivation is based on a quasiparticle Green function formalism. It is shown that this formalism can naturally describe the physical picture of the zeroth-order Hamiltonian as an approximate one-particle potential set up by the multiconfigurational reference wave function. The derivation also provides a physically meaningful definition of single-particle eigenvalues which arise from the multiconfigurational perturbation theory.
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