Abstract
A temperature difference between two NaCl crystals (after cleaning by evaporation in a vacuum) defines a supersaturation on the colder crystal. By a double gold decoration technique it has been found possible to measure the velocity of growth steps as a function of step distance. Interpretation involves a dependence of diffusion coefficient on concentration. The dependence of step velocity on supersaturation (at a given step distance) is linear whereas that on temperature is exponential. The “activation energy” of motion is approximately equal to the evaporation energy of NaCl. Conditions are described under which new nucleation sites can be observed; they occur at relatively step-free regions, where the step distance is more than twice the trapping range.
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