Abstract
Abstract The authors have measured the differential light-scattering cross sections and phase functions of single vapor-grown hexagonal ice particles levitated in an electrodynamic balance. The ice particles, grown at temperatures −5° > T > −10°C, were typically ≈50 μm in diameter and tended to orient with the c axis either nearly vertical (parallel to the scattering plane normal) or horizontal (in the scattering plane). Helium–neon laser light scattered by a levitated crystal was collected in the angular ranges 20°–65° and 115°–160° with a 1024-element linear photodiode array with an angular resolution of about 0.05°. The particle size and orientation were measured a few seconds before and after the scattering measurements with top- and side-view video telemicroscopes. Three basic features are found in the scattering from vertically aligned crystals: (i) a strong “halo” peak between about 21° and 35°, (ii) a secondary peak with ripple structure between about 30° and 70°, and (iii) a weaker peak in the ba...
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