The crystal structure of ice at low temperatures

Abstract

The use of X-ray in the study of the mechanism of crystal growth showed that if the vapour of a substance came in contact with a cold surface, it condensed to form a solid, the structure of which depended on the temperature of the condensing surface. The authors announced recently that ice formed by condensation at low temperatures and pressures also changed form with temperature. Details of the apparatus and the results follow in this paper. 2-Method and Preliminary Work Analysis was carried out by the Hull-Debye-scherrer method, using the K a doublet of copper. With a camera of 5 cm radius, photographs were obtained in 4 to 6 hours, using a shearer tube operated at 30 KV (R. M. S.) and 10 mA. The K s line was removed from the radiation by a filter of nickel foil.