A method is presented for least-squares curve-fitting of Fourier transform infrared spectra. A demonstration of the determination of xylene solution compositions illustrates the accuracy of the method. Least-squares coefficients are shown to be valuable for the analysis of several polymer systems by digital subtraction of spectra.
M. K. Antoon, J. H. Koenig, and J. L. Koenig, "Least-squares Curve-fitting of Fourier Transform Infrared Spectra with Applications to Polymer Systems," Appl. Spectrosc. 31, 518-524 (1977)