IR spectra of diamonds of different origins and upon different purification procedures

Abstract

The authors compare IR spectra of diamonds of different origins, both natural and synthetic ones—produced by detonation, dynamic, and static syntheses, and subjected to purifying treatment under various conditions. It is shown that in the IR-spectral range there are absorption bands at 421, 945, 1022, 2854, 2920, and 3368 cm^–1, which are typical of the majority of the samples studied. Whatever the origin of diamonds, their IR spectra have been found to contain absorption bands of S–S, C–S bonds (upon treatment with sulfuric acid), and C–N bonds (after treatment with nitric acid). The presence of functional C–H and–OH groups has been confirmed.