Fundamental optical spectra of ferroelectric NaNO2

Polarized spectra of complete complexes for fundamental optical functions of the NaNO₂ ferroelectric at 77K in the region of 4–24 eV for E ‖ a, E ‖ b, and E ‖ c are calculated. For the first time, integral polarized curves of dielectric permeability and specific volumetric losses of electrons are factorized into elementary transverse and longitudinal components of transfer bands and their main parameters are determined. For the calculations, the experimental reflection spectra, methods of Kramer-Kronig, and joint Argand diagrams are used. On the basis of theoretical calculations for the zones and dielectric permeability, a scheme of the nature and localization of the obtained bands for the components of separation of ?₂ is proposed in accordance with the model of interband transitions.