08258 IUPAC Gold Book - integrated intensity 10.1351/goldbook.08258 08258 current 1 Area under a spectral band in an absorption spectrum where the absorption is linearly proportional to the amount of absorber in unit area. The area under a band in a transmittance spectrum is not linearly proportional to the amount of absorber. The absorption quantity is usually a Beer-Lambert absorption coefficient, but recently \(\tilde{\nu} \alpha_{\rm{m}}''(\tilde{\nu})\), the wavenumber times the imaginary part of local molar polarizability, has been used for neat liquids to correct for dielectric effects. infrared intensity https://goldbook.iupac.org//terms/view/08617 local molar polarizability https://goldbook.iupac.org//terms/view/08634 spectral band https://goldbook.iupac.org//terms/view/08285 wavenumber https://goldbook.iupac.org//terms/view/08301 PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 662 (https://doi.org/10.1515/pac-2019-0203) https://goldbook.iupac.org/terms/view/08258/html https://goldbook.iupac.org/terms/view/08258/json https://goldbook.iupac.org/terms/view/08258/plain Citation: 'integrated intensity' 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.08258 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. 2026-06-10T12:41:36+00:00