Title: proton magnetogyric ratio Long Title: IUPAC Gold Book - proton magnetogyric ratio DOI: 10.1351/goldbook.P04912 Status: current Definition Atomic fundamental physical constant \(\gamma _{\rm{p}} = 2.675\ 221\ 28(81)\times 10^{8}\ \rm{s}^{-1}\ \rm{T}^{-1}\). Source - CODATA Bull. 1986, 63, 1 (https://doi.org/10.6028/jres.092.010) Other Outputs - html: https://goldbook.iupac.org/terms/view/P04912/html - json: https://goldbook.iupac.org/terms/view/P04912/json - xml: https://goldbook.iupac.org/terms/view/P04912/xml Citation: Citation: 'proton magnetogyric ratio' 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.P04912 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. Accessed: 2026-04-20T11:18:06+00:00