Quantitative spectroscopy is based upon the Bouguer-Lambert-Beer law, often referred to as Beer's law, which is expressed as: A = log(I0/I) = abc (1) where A is the absorbance, I0 is the background intensity, I is the intensity measured with the sample present, a is the absorptivity, b is the sample thickness, and c is the sample concentration.
Michael L. Free and Jan D. Miller, "Effect of Sample and Incident Beam Areas on Quantitative Spectroscopy," Appl. Spectrosc. 48, 891-893 (1994)
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