EMISSIVITY OF LIQUID SILICON IN VISIBLE AND INFRARED REGIONS

Normal spectral emissivity of Si melt in visible and infrared regions was determined by the direct measurement of thermal radiations from th e melt and a blackbody cavity which was located close to the melt. The spectral emissivity slightly decreases with wavelength. The emissivit y slightly changes with temperature, The spectral emissivity values in visible and in infrared region are 0.27 and 0.21, respectively. The w avelength dependence of the emissivity can be interpreted by a dielect ric response of free electrons in the melt. (C) 1997 American Institut e of Physics.