Analysis of Hpht Diamonds by Laser-Induced Breakdown Spectroscopy

The analysis of sectoral nitrogen-containing HPHT diamonds by the method of laser-induced breakdown spectroscopy was performed. The possibility of detecting changes in structural bonds and the impurity composition under conditions of laser-induced graphitization of the surface was studied. It was found that the plasma spectra of transition states of the surface during the process of laser-induced graphitization are also very important for analysis and can help in the identification of diamonds. Identification of diamonds can occur both based on detecting differences in the content of H, O, N impurities, and detecting differences in the structural disorder of carbon bonds, particularly in the relative change in the number of C=C bonds. All these differences may be a consequence of either technological differences in the history of diamond synthesis, or the presence of additional post-growth diamond processing, or with the presence of the multisectoral structure of the test sample.