{"term":{"id":"09429","title":"static limit","longtitle":"IUPAC Gold Book - static limit","doi":"10.1351\/goldbook.09429","code":"09429","status":"current","definitions":[{"id":1,"text":"Ion fluence above which any significant changes in the spectrum, arising from beam damage, are observed in secondary ion mass spectrometry.","notes":{"1":"Classically, a limit of \\(\\pu{E12}\\) ions per \\(\\pu{cm2}\\), or \\(\\pu{E16}\\) ions per \\(\\pu{m2}\\) is taken as the limit not to be exceeded in static secondary ion mass spectrometry. This limit is based on one incident ion for each \\(\\pu{1000}\\) surface atoms.","2":"For imaging, the total molecular signal can be used, and here the limit can be greater and reach \\(\\pu{100}\\) times the limit given in Note 1.","3":"For large molecules, the damage cross section and disappearance cross section are both generally larger than for small molecules, leading to a static limit less than \\(\\pu{E12}\\) ions per \\(\\pu{cm2}\\)."},"contexts":[],"links":[{"term":"secondary ion mass spectrometry","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/09192"}],"sources":["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)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/09429\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/09429\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/09429\/plain"},"citation":"Citation: 'static limit' 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.09429","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":"2026-07-24T03:00:43+00:00"}}