A novel variation of the classical method of spectral cancellation used with double-beam infrared spectrophotometers is presented. The technique described involves the simultaneous utilization of both beams of a double-beam spectrophotometer to compare the spectra of chemically related but not identical substances. The results of preliminary studies, and quantitative application of this new technique, are described.
R. P. Manno, N. Paraskevopoulos, and H. J. Matsuguma, "A Variation of the Compensation Technique in Infrared Spectrophotometry," Appl. Spectrosc. 13, 57-59 (1959)