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Information × Registration Number 0220U100067, 0119U103389 , R & D reports Title New materials for active media of is solid state lasers popup.stage_title Head Denysyuk Natalіya M., Кандидат фізико-математичних наук Registration Date 08-01-2020 Organization Institute for Problems in Materials Science popup.description2 In the present thesis the X-ray photoelectron core-level and valence-band spectra of the АPb2Х5 (A = K, Rb; Х=Br, Cl) halides have been measured as well as the X-ray emission bands representing the energy distributions of the Br 4p- and K 4s states has been recorded for the KPb2Cl5 bromides. The XPS results indicate the low hygroscopicity and high chemical stability of the АPb2Br5 (A = K, Rb) surfaces. DFT-calculations of the main optical parameters, such as the absorption coefficient, dielectric functions, refractive index, extinction coefficient, optical reflectivity coefficient and electron energy-loss spectrum of АPb2Br5 (A = K, Rb) compounds, have been made in the thesis.Measurements of the optical absorption spectra of the АPb2Br5 (A = K, Rb) compounds reveal three areas of the spectral dependence of the absorption coefficient: exponential section in the band ranging from 0 to 100 cm -1 and the region of the direct and indirect optical transitions higher this band. Product Description popup.authors popup.nrat_date 2020-04-02 Close