Optical constants of single-crystal GeS in the photon energy range 0.04–4 eV

Abstract

The optical constants of crystalline GeS have been determined in the range from just beyond reststrahlbands to 4 eV for two light polarizations lying in the plane of crystal layers. The electronic parts of the principal components of the dielectric tensor are evaluated and discussed from the viewpoint of interband transitions (anisotropy) and index-of-refraction family of sum rules and related spectroscopic theory of the chemical bond.