Koopmans' theorem

theorem in quantum mechanics that in closed-shell Hartree–Fock theory, the first ionization energy of a molecular system equals the negative of the orbital energy of the highest occupied molecular orbital
Intangible theorem Q1422649
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Koopmans' theorem

Summary

Koopmans' theorem is a theorem[1]. It draws 65 Wikipedia views per month (theorem category, ranking #226 of 1,306).[2]

Key Facts

  • Koopmans' theorem's instance of is recorded as theorem[3].
  • Tjalling Koopmans is named after Koopmans' theorem[4].
  • Koopmans' theorem's Freebase ID is recorded as /m/06srq2[5].
  • Koopmans' theorem's IUPAC Gold Book ID is recorded as K03411[6].
  • Koopmans' theorem's maintained by WikiProject is recorded as WikiProject Mathematics[7].
  • Koopmans' theorem's Microsoft Academic ID is recorded as 38525483[8].

Why It Matters

Koopmans' theorem draws 65 Wikipedia views per month (theorem category, ranking #226 of 1,306).[2] It has Wikipedia articles in 11 language editions, a strong signal of global cultural recognition.[9]

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Koopmans' theorem. Retrieved May 3, 2026, from https://4ort.xyz/entity/koopmans-theorem
MLA “Koopmans' theorem.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/koopmans-theorem.
BibTeX @misc{4ortxyz_koopmans-theorem_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Koopmans' theorem}}, year = {2026}, url = {https://4ort.xyz/entity/koopmans-theorem}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Koopmans' theorem — https://4ort.xyz/entity/koopmans-theorem (retrieved 2026-05-03)

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