{"term":{"id":"14028","title":"local differential absorption","longtitle":"IUPAC Gold Book - local differential absorption","doi":"10.1351\/goldbook.14028","code":"14028","status":"current","definitions":[{"id":1,"text":"Absorption term in the radiative transfer equation (RTE). Mathematical expression is \\[\\alpha_{\\lambda} (\\boldsymbol{x},t) L_{\\mathit{\\Omega},\\lambda} (\\boldsymbol{x}\/t)\\] with \\(\\alpha_{\\lambda} (\\boldsymbol{x},t)\\) the space- and time-dependent linear napierian absorption coefficient and \\(L_{\\mathit{\\Omega},\\lambda} (\\boldsymbol{x},t)\\) the spectral radiance arriving at position \\(x\\) and time \\(t\\) from every possible angular directions \\(\\mathit{\\Omega}\\).","links":[{"term":"radiative transfer equation","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/14077"}],"sources":["PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 960 (https:\/\/doi.org\/10.1351\/PAC-REC-09-09-36)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/14028\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/14028\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/14028\/plain"},"citation":"Citation: 'local differential absorption' 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.14028","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":"2026-06-28T21:03:44+00:00"}}