To overcome its limitations, the HF method can be supplemented with post-HF methods such as: - Configuration Interaction (CI): Involves considering multiple Slater determinants to account for electron correlation. - Møller-Plesset Perturbation Theory (MP2): Adds a perturbative correction to the HF energy to include electron correlation effects. - Coupled Cluster (CC) Methods: Provide a more sophisticated way to account for electron correlation by considering excitations from the HF reference state.
