intrinsic reaction coordinate 

https://doi.org/10.1351/goldbook.IT07057
A minimum-energy reaction path on a potential energy surface in mass-weighted coordinates, connecting reactants to products via the transition state.
Source:
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1947 [Terms] [Paper]
Citation: 'intrinsic reaction coordinate' 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.IT07057 RIS BibTex EndNote
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Last revised: February 24, 2014