I have measured ftir spectra of several silica samples using KBr method. Since the sample thickness is different, how can I normalize the spectra so that I can quantitatively compare each sample?
Usually you ensure comparably thicknesses by using the same amount of KBr and sample. Since it is not easy to obtain always the same weights, you can correct this by calculating the actual concentration from the weights of KBr and substance and the thickness of the sample.