absorptivity [obsolete]

https://doi.org/10.1351/goldbook.A00044
Absorptance divided by the optical path length. For very low attenuance it approximates the absorption coefficient [within the approximation (1−e−A)∼A]. The use of this term is not recommended.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2227 [Terms] [Paper]
Citation: 'absorptivity' 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.A00044 RIS BibTex EndNote
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