Abstract
The PCILO method was first introduced by Diner et al [1]. A general description of the main features of the method has been given in a recent review [2] as well as a detailed discussion of a new version of the method [3]. The purpose of the present contribution to the Localization/Delocalization problem is to recall briefly the central role played in the PCILO method by a localized picture of the molecular electronic structure. As it is shown in the first section, the use of localized molecular orbitals allows:
-
(α)
the easy construction of a zeroth-order determinant which is a good approximation of the exact wave-function.
-
(β)
a simplification (which is drastic if one uses a Zero Differential Overlap hypothesis) in the perturbative solution of the Configuration Interaction problem.
-
(γ)
a decomposition of the total energy as a sum of localized transferable contributions attached to one bond, two bonds, three bonds, etc.
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Daudey, J.P., Malrieu, J.P. (1976). How does the PCILO Method Take Advantage of Localization?. In: Chalvet, O., Daudel, R., Diner, S., Malrieu, J.P. (eds) Localization and Delocalization in Quantum Chemistry. Localization and Delocalization in Quantum Chemistry, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1456-4_10
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