{"term":{"id":"14042","title":"photocatalytic activity","longtitle":"IUPAC Gold Book - photocatalytic activity","doi":"10.1351\/goldbook.14042","code":"14042","status":"current","initialism":"<em>initialism<\/em>: PCA","definitions":[{"id":1,"text":"Number of entities (product) formed in a photocatalytic process (alternatively the number of reactant entities disappearing) divided by the number of photons absorbed by the photocatalyst at one single wavelength or within a defined wavelength range. For one wavelength it has the same meaning as quantum yield, whereas within a defined wavelength range it has the same meaning as quantum efficiency.","notes":{"1":"This quantity has a well-defined meaning only when the reaction conditions are also stated and the results reported in terms of the initial conditions."},"sources":["PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 967 (https:\/\/doi.org\/10.1351\/PAC-REC-09-09-36)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/14042\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/14042\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/14042\/plain"},"citation":"Citation: 'photocatalytic activity' 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.14042","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":"2026-06-21T16:00:44+00:00"}}