Research note
Dynamic versus static electronic correlation
In quantum chemistry, when a nomenclature in which one distinguishes between “static” and “dynamic” correlation is used, “correlation” referrers to all the deficiencies of the Hartree-Fock (HF) single-determinantal approach. For instance, the the *correlation energy* is defined as the difference between the exact (non-relativistic) energy and the HF energy (calculated with a complete basis), …