threshold energy

symbol: $E_{0}$
https://doi.org/10.1351/goldbook.T06366
Potential energy gap between reactants and the transition state, sometimes involving the zero point energies, but usually not.
See also: critical energy
Sources:
Green Book, 2nd ed., p. 56 [Terms] [Book]
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 189 [Terms] [Paper]
Citation: 'threshold energy' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.T06366 RIS BibTex EndNote
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