Loss of Information by Differentiation vs. Increase in Resolution

Distribution functions (e. g., Gaussian or Lorentzian distributions) are e functions their differentiation leads to further e functions, which are extended by only one factor, see Eqs. (2-23)-(2-28) in Sec. 2.3. Although these distribution equations become 

It is therefore possible to eliminate disturbing background absorption (e.g., in turbid solutions or opaque samples) caused by stray light (Fig. 2-20). 

Differentiation can thus considerably improve the detection sensitivity of masked weaker bands for the first time, a qualitative or quantitative determination of these bands is now possible. 

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