07389 IUPAC Gold Book - global analysis 10.1351/goldbook.GT07389 GT07389 current abbrevs: DAS, LADS, LAS 1 Method for kinetic analysis of time-resolved emission or absorption data. Typical for the analysis of emission (or transient absorption) data. Upon excitation with a particular wavelength, radiant intensity of the emission (or transient absorbance difference) decays are observed as a function of a variable parameter, e.g., the observation wavelength, but otherwise under the same condition. All decays are then analysed together (globally) under the constraint that the lifetimes of the transient species do not vary with the variable parameter, e.g., the observation wavelength in the given example. Lifetime-associated spectra (LAS), also called decay-associated spectra (DAS), are thus obtained. In the case of transient absorption data, the resulting spectra are often called lifetime-associated difference spectra (LADS). absorbance https://goldbook.iupac.org/terms/view/A00028 absorption https://goldbook.iupac.org/terms/view/A00036 emission https://goldbook.iupac.org/terms/view/E02056 lifetimes https://goldbook.iupac.org/terms/view/L03515 radiant intensity https://goldbook.iupac.org/terms/view/R05045 variable https://goldbook.iupac.org/terms/view/V06600 wavelength https://goldbook.iupac.org/terms/view/W06659 PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 349 (https://doi.org/10.1351/pac200779030293) https://goldbook.iupac.org/terms/view/GT07389/html https://goldbook.iupac.org/terms/view/GT07389/json https://goldbook.iupac.org/terms/view/GT07389/plain Citation: 'global analysis' 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.GT07389 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. 2026-05-10T15:04:08+00:00