Roughening transition observed on the prism facet of ice

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Abstract
Single crystals of ice are grown from vapor, and viewed by means of an interference microscope. The basal facet persists until melting, but the prism facet disappears above about -2 °C, the surface taking a dome shape. With the temperature dropping from near 0 °C, a facet reappears at -1.35 °C. The measured curvature just above the transition is consistent with the prediction of a ‘‘universal curvature jump’’ by Jayaprakash, Saam, and Teitel. The surface curvature near the facet edge is also measured.