Molar absorption coefficient

Definition: The molar (decadic) absorption coefficient (formerly: molar decadic extinction coefficient) is an intrinsic property of a given molecule (chromophore) or substance that describes how strongly that molecule/substance absorbs light at a particular wavelength. It is equal to absorbance (A, base 10) divided by the absorption pathlength, d, and the amount concentration, c:It is generally represented by the unit M^{-1} cm^{-1} (=L mol^{-1} cm^{-1}.

Alternative definition:

Synonym: molar absorption coefficient, molar attenuation coefficient

References:

Related terms: optical density, modified beer-lambert law, attenuation, absorption of light  

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