Abstract
The full configuration interaction problem for the ionized v-electron shell is formulated in terms of the variational quantities U_k=U_k (1... v ∣ v+1... k+v), which are v-electron functions for the first v indices of electrons and are operators for all others. While operating on the Hartree–Fock determinant of the starting molecule, these Uk generate a complete set of hole–particle excitations of (v+k)hkp type and provide a faithful description of ionization. A system of looped equations has been obtained for Uk. The system is used to seek a matrix representation of the two-electron ionization problem in an approximation equivalent to the EOM-CCD scheme, implementing the equation-of-motion method for two-particle coupled clusters. An approximate Hamiltonian has been derived for valence electrons traveling in an effective field of correlated (CCD method) core electrons.
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Luzanov, A.V. Hole Description of Many-Electron Ionization in the Full Configuration Interaction Method and Coupled Cluster Approximation. Journal of Structural Chemistry 44, 717–727 (2003). https://doi.org/10.1023/B:JORY.0000029806.98575.85
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DOI: https://doi.org/10.1023/B:JORY.0000029806.98575.85