internal absorptance, \(\alpha_{\text{i}}\)
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https://doi.org/10.1351/goldbook.I03100
absorptance when surface effects and effects of the cuvette such as reflection losses are excluded.
Source:
Green Book, 2
nd
ed., p. 32 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)