Estimate electronic terms for molecular energy studies. Review orbital and interaction effects. Export clear results for quantum chemistry reporting today.
This page uses a single-column page structure. The form itself shifts across three, two, and one columns responsively.
| Parameter | Example Value | Unit | Meaning |
|---|---|---|---|
| Occupied Orbitals | 5 | count | Closed-shell occupied molecular orbitals. |
| Σhii | -74.2500 | Eh | Total one-electron orbital contribution. |
| ΣJij | 46.8000 | Eh | Total Coulomb interaction contribution. |
| ΣKij | 11.9500 | Eh | Total exchange interaction contribution. |
| Nuclear Repulsion | 8.9120 | Eh | Repulsion between fixed nuclei. |
| Reference Energy | -75.8000 | Eh | Benchmark or literature comparison value. |
For a restricted closed-shell Hartree-Fock style estimate, this calculator uses:
ERHF = 2Σhii + 2ΣJij − ΣKij + ENN
Where Σhii is the sum of one-electron integrals, ΣJij is the summed Coulomb interaction, ΣKij is the summed exchange interaction, and ENN is nuclear repulsion energy.
The calculator then applies optional adjustments:
Adjusted Energy = ERHF + Correlation Correction + Manual Energy Shift
This gives a practical comparison value for teaching, estimation, and method-checking workflows.
It estimates a restricted closed-shell Hartree-Fock style energy from pre-summed electronic and nuclear terms. It is useful for validation, learning, and quick reporting.
No. It does not solve orbitals, build basis sets, or run self-consistent field iterations. It evaluates energy from values you already computed elsewhere.
In closed-shell Hartree-Fock expressions, exchange lowers the total energy for same-spin electron interactions. That is why the summed exchange contribution appears with a negative sign.
Enter all energy inputs in Hartree. The calculator automatically converts the final values to eV, kJ/mol, and kcal/mol for easier interpretation.
It lets you compare the calculated adjusted energy against a benchmark result from literature, software output, or another method.
Yes. Add an optional correction if you want a simple post-Hartree-Fock style adjustment for teaching or approximate comparison purposes.
Not directly in this simplified equation. The orbital count is mainly used for the energy-per-orbital metric and consistency checks in reporting.
It is useful during coursework, method comparisons, report preparation, and quick verification of energy term assembly from external quantum chemistry results.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.