Term: isooptoacoustic point
https://doi.org/10.1351/goldbook.I03302

Definition:
wavelength, wavenumber or frequency at which the total energy emitted by a sample as heat does not change upon a chemical reaction in or a physical change of the sample. Its position depends on the experimental conditions.

Note: The spectral differences between the @I03310@ points and the iso-optoacoustic points are the result of the non-linear relationship between the @M03972@ and the photoacoustic signal.

Related Terms:
1) wavelength (http://doi.org/10.1351/goldbook.W06659).
2) wavenumber (http://doi.org/10.1351/goldbook.W06664).
3) frequency (http://doi.org/10.1351/goldbook.F02525).
4) isosbestic (http://doi.org/10.1351/goldbook.I03310).
5) molar absorption coefficient (http://doi.org/10.1351/goldbook.M03972).

Source: PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 358 (https://doi.org/10.1351/pac200779030293)

Citation: 'isooptoacoustic point' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.I03302

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.

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.