absorptivity (extinction coefficient; absorption cross section; decadic absorptivity)
(a) Compare with molar absorptivity and absorbance .The absorbance of a solution per unit of path length and per unit concentration; a = A/(bc) where a, A, b, and c are the absorptivity, absorbance, path length, and concentration, respectively. Absorptivity varies with wavelength of the incident light. | ||||
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