Matrix isolation Fourier transform infrared spectra (MI/FT-IR) of a series of essential oil components have been described. Clear, well-defined differences were detected in the MI/FT-IR spectra of compounds having minor differences in their structure. A library search routine was found to correctly identify components of interest when visual differences were not clearly evident. The presence of discrete conformers in the argon matrix resulted in the presence of split absorptions in the carbonyl band for selected compounds.
W. M. Coleman and Bert M. Gordon, "Examinations of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part XV," Appl. Spectrosc. 43, 1004-1008 (1989)