Napierian absorbance (
\(A_{\rm{e}}\)) divided by path-length (
\(l\)) and amount concentration (
\(c\)).
\(\kappa = A_{\rm{e}}/(cl)\).
See also: linear Napierian absorption coefficient, molar decadic absorption coefficient
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 667 (https://doi.org/10.1515/pac-2019-0203)