## Wikipedia - Absorptivité molaire (fr) absorption coefficient

https://doi.org/10.1351/goldbook.A00037
Linear decadic ($$a$$,$$K$$) and Napierian absorption coefficients ($$\alpha$$) are equal to the corresponding @A00028@ divided by the optical path length through the sample. The molar absorption coefficients (decadic $$\varepsilon$$, Napierian $$\kappa$$) are the linear absorption coefficients divided by the @A00295@.
Source:
Green Book, 2nd ed., p. 32 [Terms] [Book]