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Additional resources for Thermophysics of Spacecraft and Planetary Bodies. Radiation Properties of Solids and the Electromagnetic Radiation Environment in Space
27 CURT H. LIEBERT The index of refraction (n^) and absorption index (k^) of the silicon specimens at temperatures of 300°, 882°, and 1074°K were also obtained using the FCA theory. The values of k^ obtained from the FCA theory at 300°K were used to calculate α^. These values of α^ were compared with those in the literature, which are based on the optical ray absorption theory. Good qualitative agreement was obtained from this comparison. Thus, it was concluded that the FCA theory can be used with reasonable accuracy to obtain the n·^ and k^ of opaque media.
Figures 2 and 3 show that the "best agreement of experiment and theory was achieved at the highest values of N n or N p in the wavelength region of 12 to 35 μ and at room temperature. As N n or N p decreases, the agreement at room temperature is good only at progressively greater wavelengths. 8 μ and at the elevated temperatures. However, the curves may asymptotically approach the calculated values at the longer wavelengths (see Fig. 2a). Comparison of the Free Carrier Absorption Theory with Experiment Free carrier absorption theory.
Howarth and Gilbert5 experimentally determined the roomtemperature spectral reflectivity of highly doped n-type silicon for purposes of determining the free electron effective mass. 8 μ with the data obtained herein indicated good agreement. References •^orn, M. , Principles of Optics New York, 1964). , CURT H. LIEBERT ^Moss, T. , Optical Properties of Semi-Conductors (Butterworths Scientific Publications, London, 196lJ7 3 Ashby, N. , "The theory of emissivity of metals", Symposium on Thermal Radiation of Solids, NASA SP-55, pp.