ИСТИНА

The changes that occurred in the crystal structure of natural diamond under the influence of a pulsed femtosecond laser (525 nm) were comprehensively investigated using the FT-IR, EPR and PL spectroscopy methods. Changes occur not only with the defects present, but also occur in areas of the regular diamond structure. These changes are complex and interrelated (cooperative effects). On the one hand, transformations are observed associated with a decrease in the concentrations of structural centers not associated with vacancies or interstitial atoms – centers A (FT-IR spectroscopy), P1 and W7 (EPR). On the other hand, the intensities of polyatomic centers B2 (platelets, layers of interstitial carbon atoms (FT-IR)) and N2 (fragments of the structure with broken C-C bonds (EPR)) increase, as well as the concentrations of H3, NV0 and NV– (PL) centers associated with vacancies increase. Thus, the changes occurring in the diamond structure fully correspond to the model of the appearance and migration of interstitial carbon atoms and vacancies.