09365 IUPAC Gold Book - beam chopper 10.1351/goldbook.09365 09365 current 1 Electrostatic or electromagnetic device used to generate pulses of ions from a continuous ion beam. The beam chopper can be used to define the pulse length and hence the mass resolution in a time-of-flight mass spectrometer and it can also be used to select particular ions in a beam that contains more than one species. beam bunching https://goldbook.iupac.org//terms/view/09393 ion beam https://goldbook.iupac.org//terms/view/09260 PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1832 (https://doi.org/10.1515/pac-2019-0404) https://goldbook.iupac.org/terms/view/09365/html https://goldbook.iupac.org/terms/view/09365/json https://goldbook.iupac.org/terms/view/09365/plain Citation: 'beam chopper' 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.09365 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. 2026-06-07T12:45:51+00:00