Measurements of the Reflectivity of Single Crystal Ag2F at Room Temperature

Abstract

Optical reflectivity spectrum of silver subfluoride, Ag ₂ F, is measured from 9,000 Å (1.377 eV) to 3,000 Å (4.132 eV) at room temperature. The spectrum shows typical metallic features which are expected from Drude's classical free electron theory in metal; the reflectivity is fairly high and constant against wavelength in the long wavelengths region, while it decreases rapidly, almost to zero, at the specific wavelength which is known as “the UV window”. The optical constants are calculated from the reflectivity spectrum, and the real part of the complex dielectric constant is found to be zero at the photon energy of 2.572 eV (4,520 Å); which is the plasma criterion of the free electron gas in the metal.