Title: dissociation energy
Long Title: IUPAC Gold Book - dissociation energy
DOI: 10.1351/goldbook.D01802
Status: current
Index: quantity

Definition
Energy required to dissociate a molecule into two parts. Subscripts 0 and e, i.e. \(D_{0}\) and \(D_{\rm{e}}\), are used to denote the dissociation from the ground state and potential energy minimum, respectively.

Related Terms
- bond-dissociation energy: https://dev.goldbook.iupac.org/terms/view/B00699
- dissociation: https://dev.goldbook.iupac.org/terms/view/D01801
- ground state: https://dev.goldbook.iupac.org/terms/view/G02704

Source
- Green Book, 2nd ed., p. 20 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)

Other Outputs
- html: https://dev.goldbook.iupac.org/terms/view/D01802/html
- json: https://dev.goldbook.iupac.org/terms/view/D01802/json
- xml: https://dev.goldbook.iupac.org/terms/view/D01802/xml

Citation: Citation: 'dissociation 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.D01802
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Accessed: 2026-06-13T03:07:03+00:00