Infrared Transmission through Gold Black Deposits

概要

論文の詳細を見る
Infrared transmission of gold black deposits produced by evaporation in the atmosphere of nitrogen depends critically on the condition of preparation. A nearly constant transmission in the wavelength region 2〜15 μ is realized under the following three conditions. (1) The concentration of oxygen as impurity in nitrogen is less than 0.001%. (2) The pressure of nitrogen is about 1 mmHg. (3) The gold metal (purity:99.99%) is evaporated from a V-shape filament with no cracks (2μ wide) on its surface. The infrared transmittance does not follow the law of exponential attenuation with thickness. This behavior is interpreted by the theory of radiative transfer through a medium with both absorption and scattering. The mass absorption coefficient of the deposit α_k, decreases with increasing wavelength λ, and is expressed as α_k=const.×1/λ^m (m<0). The variation of mass scattering coefficient with wavelength is not so simple and does not obey the law of Rayleigh scattering.
社団法人応用物理学会の論文
1972-07-05