Physics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........6c&link_type=abstract
Ph.D. Thesis Nevada Univ., Reno.
Physics
Air, Copper Sulfides, Gas Pressure, Ice Formation, Nucleation, Pressure Dependence, Vapor Phase Epitaxy, Diffusion, Free Energy, Interferometry, Supersaturation, Surface Roughness, Temperature Dependence
Scientific paper
The advance velocity of nonthickening crystals and basal steps were measured as a function of temperature, supersaturation, and air pressure, using an optical interference technique. Ice crystal growth at -7 C in a thermal diffusion chamber was also investigated as a function of supersaturation. The radial growth rates of nonthickening crystals and the advance velocity of a 0.08 micrometer step increased with decreasing pressure suggesting a pressure dependence of vapor diffusivity. Abnormally slow growth of crystals thinner than 0.3 micrometer at 4% supersaturation and the sublimation of thin crystals ( 1 micrometer) in the neighborhood of a thicker crystal indicated that nonthickening crystals are pseudomorphically strained to fit the substrate within a layer some ten atomic spacings thick, above which the strain decreases inversely as the crystal thickness. Results suggest that ice crystal growth follows a two dimensional nucleation combined with a progressive roughening of the surface with increasing temperature.
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