Term: mass spectrometry https://doi.org/10.1351/goldbook.M03746 Definition: The branch of science dealing with all aspects of mass spectroscopes and the results obtained with these instruments. Source: Orange Book, 2nd ed., p. 201 (https://media.iupac.org/publications/analytical_compendium/) Citation: 'mass spectrometry' 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.M03746 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. 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.