Spectral ellipsometry studying of iron's optical and electronic properties

Abstract

Fe’s optical and electronic properties were investigated at room temperature in different structural states. The sample’s surface was explored in wide spectral range &lambda; = 0,23−17,0 &mu;<i>m</i> (E = 4,96 − 0,07 <i>еV</i> ) by the Beatty’s spectral ellipsometry method. While an experiment was carried out ellipsometry parameters <i>&Delta;</i> and <i>&psi;</i> were measure near the principal angle of incidence. The refraction index <i>R</i> , permittivity <i> Ɛ</i> and optical conductivity <i>&sigma;</i>( <i>hν</i> ) , that is proportional to the interband density of electronic states, were calculated using these parameters. Fe’s optical conductivities in liquid, amorphous and crystalline states were compared in this work. The optical conductivity was calculated using the published data of the iron’s density of electronic states in crystalline, amorphous and liquid states for the comparison of the experimental and theoretical results. It is shown that, at structural transformations “amorphous, liquid state– crystalline state”, the optical properties of metallic iron are determined, in the first turn, by the nearest neighborhood, and the electronic structure is not subjected to significant modifications.