Molar absorption coefficient



(1) A measure of how strongly a chemical species absorbs light at a particular wavelength. It is often expressed in units of cm-1M-1.

(2) A fundamental unit in spectrophotometry.


It is symbolized by ε in Beer-Lambert law, A = εcl, where A is the absorbance of the sample, l is the pathlength (usually in centimeter), and c is the concentration of the of absorbing species in the material (moles per liter).


See also: Beer-Lambert law

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