pre-exponential factor

symbol: $A$
synonyms: Arrhenius A factor, A-factor
https://doi.org/10.1351/goldbook.P04811
Coefficient in front of the exponential factor expressing the empirical temperature dependence of the rate coefficient, \(k\), on temperature, \(T\), \(k=A\ \exp (- E_{\rm{a}}/R\ T)\), where \(E_{\rm{a}}\) is the activation 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 177 [Terms] [Paper]
Citation: 'pre-exponential factor' 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.P04811 RIS BibTex EndNote
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