09443 IUPAC Gold Book - observed interface width 10.1351/goldbook.09443 09443 current synonym: depth resolution 1 In secondary-ion mass spectrometry, Auger electron spectroscopy, and X-ray photoelectron spectroscopy, distance over which a change in signal intensity from \(\pu{16\%}\) to \(\pu{84\%}\), or from \(\pu{84\%}\) to \(\pu{16\%}\), is measured at the junction of two dissimilar matrices, the thicknesses of which are more than six times that distance The change in signal intensity should be quoted with the observed interface width. Auger electron spectroscopy https://goldbook.iupac.org//terms/view/09172 depth resolution parameter https://goldbook.iupac.org//terms/view/09245 secondary-ion mass spectrometry https://goldbook.iupac.org//terms/view/09192 PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1808 (https://doi.org/10.1515/pac-2019-0404) https://goldbook.iupac.org/terms/view/09443/html https://goldbook.iupac.org/terms/view/09443/json https://goldbook.iupac.org/terms/view/09443/plain Citation: 'observed interface width' 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.09443 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. 2026-06-11T22:20:46+00:00