Title: correlation energy
Long Title: IUPAC Gold Book - correlation energy
DOI: 10.1351/goldbook.C01349
Status: current

Definition
The difference between the Hartree–Fock energy calculated for a system and the exact non-relativistic energy of that system. The correlation energy arises from the approximate representation of the electron-electron repulsions in the Hartree–Fock method.

Related Term
- Hartree: https://goldbook.iupac.org//terms/view/H02747

Source
- PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2234 (https://doi.org/10.1351/pac199668122223)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/C01349/html
- json: https://goldbook.iupac.org/terms/view/C01349/json
- xml: https://goldbook.iupac.org/terms/view/C01349/xml

Citation: Citation: 'correlation energy' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.C01349
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Accessed: 2026-06-30T13:03:24+00:00