Alexander Zaitsev (“NY University”, USA)
- Date: June 3, 2021
- Length: 2h 9m
In this lecture, the physical principles underlying optical spectroscopy, differences between the spectroscopic methods, and the efficiency of these methods in the characterization of diamonds are briefly reviewed. Three major types of optical spectroscopy used in diamond research are Raman scattering spectroscopy, absorption spectroscopy, and luminescence spectroscopy. All three methods are based on the measurement of the energy of the photons involved in the excitation and relaxation of the electrons in a regular diamond crystal lattice and in its defects. The spectrum and intensity of the absorbed light are measured in optical absorption. Thus, absorption deals with the analysis of the processes of excitation of electrons and atomic vibrations.
The processes of relaxation of the absorbed energy via re-emission of light is the subject of luminescence (commonly called photoluminescence or PL) and Raman scattering spectroscopies.
Dr. Alexander M. Zaitsev obtained his M.S. degree in physics in 1975 from the Belarussian State University in Belarus and a Ph.D. degree in 1980 from the Physical Institute of the Academy of Sciences of the USSR, Moscow. From 1980 to 1992 he was a researcher in the Belarussian State University where he was awarded a DSc degree in physics and mathematics. At present he is a professor of physics at the College of Staten Island (CUNY), a member of the doctoral faculty in physics and chemistry of the Graduate Center of the City University of New York, and a consultant for Gemological Institute of America. The current research interests of Professor Zaitsev are focused on spectroscopy of diamond and the technology of CVD diamond.