Title: stop event
Long Title: IUPAC Gold Book - stop event
DOI: 10.1351/goldbook.09430
Status: current

Definition
Registration of a particle by a time-to-digital converter in secondary ion mass spectrometry.

Note
The arrival time for each ion providing a pulse at the detector is registered by the time-to-digital converter (TDC). This is a stop event. TDCs might only record a fixed number of stop events during the time following each primary-ion pulse, for example 512 or 1024, other events being lost.

Related Terms
- primary-ion: https://goldbook.iupac.org//terms/view/09414
- secondary ion mass spectrometry: https://goldbook.iupac.org//terms/view/09192

Source
- PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1845 (https://doi.org/10.1515/pac-2019-0404)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/09430/html
- json: https://goldbook.iupac.org/terms/view/09430/json
- xml: https://goldbook.iupac.org/terms/view/09430/xml

Citation: Citation: 'stop event' 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.09430
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: 2026-07-24T18:40:06+00:00