Condensation Coefficients in the Growth of Cadmium and Zinc from the Vapor

Condensation coefficients of essentially unity have been determined for the growth of zinc and cadmium from the vapor phase at high supersaturations in ultra-high vacua. These data indicate that no impingent atoms are reflected, and that all adsorbed atoms are incorporated into the growing crystal by Volmer's disk nucleation and growth mechanism. The adsorption of gaseous impurities at a residual gas pressure of 10—4 mm Hg did not affect the condensation coefficient for condensation at high fluxes.