12455 IUPAC Gold Book - isotopomeric ion 10.1351/goldbook.12455 12455 current 1 Isomeric ions having the same numbers of each isotopic atom but differing in their positions within the ion. Isotopomeric ions can be either configurational isomers in which two atomic isotopes exchange positions or isotopic stereoisomers. Isotopomer is an abbreviation of isotopic isomer. \(\ce{D2C=CH2^{+.}}\) and \(\ce{HDC=CHD^{+.}}\). PAC, 2013, 85, 1515. 'Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)' on page 1558 (https://doi.org/10.1351/PAC-REC-06-04-06) https://goldbook.iupac.org/terms/view/12455/html https://goldbook.iupac.org/terms/view/12455/json https://goldbook.iupac.org/terms/view/12455/plain Citation: 'isotopomeric ion' 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.12455 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. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. 2026-07-29T18:43:43+00:00