Optical Properties of Amorphous GeS in the Spectral Region of 18 to 38 eV

Synchrotron radiation is used in the measurements of the reflectance spectra of amorphous germanium monosulphide for several angles of incidence in the far ultraviolet region of 18 to 38 eV. The data are evaluated using a modification of the reflectance vs. angle of incidence method for extracting the information on n, the index of refraction, and k, the extinction coefficient. The values of the normal incidence reflectivity and the phase of reflection as obtained from n and k are matched to other experimental data of the spectral region from 0 to 18 eV. Finally, the optical properties of the material are evaluated in the whole spectral region from 0 to 38 eV. The resulting spectra of real and imaginary components of permittivity ϵ - ϵ1 + iϵ2, as well as the derived quantities of −Im(1/ϵ), −Im(1/(ϵ + 1)), ϵ2ω2 and Neff, the effective number of electrons per atom engaged in optical transitions, are discussed and compared with available theoretical estimates. [Russian Text Ignored]