Glancing-angle X-ray scattering studies of the premelting of ice surfaces

摘要: Abstract The onset of surface melting at [lcub]00.1[rcub] (“basal”), [lcub]10.0[rcub] and [lcub]11.0[rcub] (“nonbasal”) surfaces hexagonal ice is studied experimentally by glancing-angle X-ray scattering. preparation mirror-like single crystal a special in situ chamber described detail. scattering experiments using synchrotron radiation give clear evidence that all the investigated high-symmetry exhibit with temperatures T s ≅ − 13.5°C for basal 12.5°C nonbasal surfaces. temperature dependence thickness quasiliquid presented discussed view various theoretical predictions. In addition we found thermal faceting as well diffuse (“rough”) solid-quasiliquid interface. properties observed disorder implies correlation length within socalled “surface melt” much larger than bulk liquid indicating presence significant “substrate” interactions.