SEARCH Articles Figures Tables Configuration Interaction Configurational interaction Local interaction Local orbitals Localized orbitals Orbital configurations Orbital interaction perturbation Orbital localization Orbital localized Orbital perturbation Orbital perturbed Orbitals perturbations Perturbation configuration interaction using Perturbational configuration interaction Perturbative Configuration Interaction Perturbative Configuration Interaction using Localized Orbitals Perturbative Configuration Interaction using Localized Orbitals