The infrared spectra in polarized light of oriented crystalline samples of thiosemicarbazide were measured and the approximate transition moment directions of most infrared active vibrations were determined. On the basis of these data a vibrational assignment is proposed. A phenomenon of continuous frequency shifts of the absorption maxima with the rotation of the plane of the polarized light was observed for several bands. The effect is interpreted in terms of intermode mixing between diffuse levels and should occur for all monoclinic and trichnic crystals which show spectra with broad bands.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry