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 Perturbation configuration interaction using localized orbitals Perturbation configuration interaction using localized orbitals Perturbational configuration interaction Perturbative Configuration Interaction