Raman spectra of powders of aromatic compounds

A method for fiber-optic recording of Raman spectra has been developed based on the use of fiber-optic cells, photon traps, a copper vapor laser, a small-sized spectrometer, and a data processing system. The Raman spectra of micropowders of a number of aromatic compounds and pharmaceuticals (C15H11NO, C14H12, C9H8O4) were studied. It was established that by using resonator cells and fiber optics technology in micropowders of the studied compounds at room temperature, a Raman opalescence regime can be realised, consisting of a significant increase in the intensity of Raman scattering. It was found that, under the recording conditions used, the intensity of the Raman lines of the compounds studied was comparable to the intensity of the excitation line. Subsequently, such studies will open up broad opportunities for recording and studying weak Raman signals.

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