Synchrotron reflectivity spectra and optical properties of rare-earth oxides

The spectra of the complete set of optical functions for nine sesquioxides of rare-earth elements of the R₂O₃ group are obtained at 300 K in the energy range 0–50 eV. The calculations are carried out on the basis of synchrotron reflectivity spectra and computer programs using the Kramers-Kronig relations. The main features of the optical spectra and their dependence on the nature of rare-earth elements were determined.