Abstract
The suggested method consists in measuring the IR spectrum of any oriented sample placed in the common beam of an IR-spectrometer with a polarizer in the sample beam, the zero line being set in the middle of the transmittance scale. The spectrum contains positive and negative bands depending on the orientation of the vibracional transition moments. This differencial technique has the features of a modulation spectroscopy method. The corresponding differential infrared linear dichroic (DIRLD) spectra exhibit simple pattern of the IR-active bands (positive, negative or missing) directly linked with the symmetry properties of the molecular vibrations.
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