The Spectral Emissivity and Optical Properties of Tungsten

摘要

We show that the spectral emissivity of tungsten is caused by the classical electro-magnetic reflection and refraction of black-body light incident upon the metal-vacuum interface from inside the metal. Equations for the spectral emissivity of tungsten as a function of the direction of polarization and the angle of viewing the tungsten surface are developed in terms of the optical constants of tungsten. The optical constants of tung¬sten are computed by comparing these equations with the experimental data.nAn attempt is made to explain the main features of these data in terms of a combin¬ation of the Lorentz elastically bound electron theory of insulators and the Drude-Zener-Kronig free-electron theory of metals.