absorptance, α 

https://doi.org/10.1351/goldbook.A00035
Ratio of the absorbed to the incident radiant power. Also called absorption factor. When α≤1, α≈Ae, where Ae is the Napierian absorbance.
Source:
Green Book, 2nd ed., p. 32 [Terms] [Book]
See also:
PAC, 1985, 57, 105. (Names, symbols, definitions and units of quantities in optical spectroscopy (Recommendations 1984)) on page 114 [Terms] [Paper]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2226 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 959 [Terms] [Paper]
Citation: 'absorptance' 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.A00035 RIS BibTex EndNote
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Last revised: February 24, 2014