MEASUREMENTS OF REFRACTIVE INDEX, DENSITY, AND REFLECTED LIGHT DISTRIBUTIONS FOR CARBON DIOXIDE AND WATER CRYODEPOSITS
Final rept. Oct 1967-Dec 1968
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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By using interference techniques, the density and the refractive index as a function of the wavelength of water and carbon dioxide cryodeposit formed at a temperature of 77K and a deposition pressure of about 0.0004 mm Hg have been measured. It is shown that the Lorenz-Lorentz constant at a certain wavelength computed from the refractive index and density of the cryodeposit is equal to that of the same substance at different temperature and phase, but at the same wavelength. Biangular distributions of the radiation reflected from water and carbon dioxide deposit formed at 77K on polished copper and black paint substrates have been obtained for various deposit thicknesses and monochromatic light of a wavelength of 0.7 to 1.0 microns. The influence of the deposition rate and of the wavelength of the radiation on the biangular distributions and also on the off-specular shift of the peak of the reflected radiation are investigated. Thus conclusions are drawn about the roughness of the vacuum-deposit interface of the cryodeposit. It is found that water forms a quite smooth interface, while the interface of carbon dioxide is rather rough.
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