14034 IUPAC Gold Book - photoadsorption capacity 10.1351/goldbook.14034 14034 current 1 Maximal number of entities (molecules, atoms, or ions) per regular surface site that can be photoadsorbed at a uniformly irradiated surface of an adsorbent, \(\theta_{\rm{max}} = N_{\rm{max}}/N^{\rm{ss}}\) where \(N_{\rm{max}}\) is the maximal number of entities photoadsorbed and \(N^{\rm{ss}}\) is the number of surface sites (mainly regular surface sites, i.e., regular lattice ions or atoms; typically, \(N^{\rm{ss}}\) ca. \(\pu{E15 cm-2}\)). \(\theta_{\rm{max}}\) is a quantity of dimension one (a fractional number). \(\theta_{\rm{max}}\) is about \(\pu{E-5 - E-3}\). This term has been often called maximal photoadsorption capacity. This denomination is redundant, because capacity already refers to the maximal possible value of a property. dynamic photoadsorption process https://goldbook.iupac.org//terms/view/14006 photoadsorbed https://goldbook.iupac.org//terms/view/14032 photoadsorption fraction https://goldbook.iupac.org//terms/view/14037 regular surface site https://goldbook.iupac.org//terms/view/14083 turnover number https://goldbook.iupac.org//terms/view/14101 PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 964 (https://doi.org/10.1351/PAC-REC-09-09-36) https://goldbook.iupac.org/terms/view/14034/html https://goldbook.iupac.org/terms/view/14034/json https://goldbook.iupac.org/terms/view/14034/plain Citation: 'photoadsorption capacity' 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.14034 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. 2026-06-30T10:26:33+00:00