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We present a series of experiments investigating the growth of ice crystalsfrom water vapor in the presence of a background gas. We measured growthdynamics at temperatures ranging from -2 C to -25 C, at supersaturationsbetween 0.5 and 30 percent, and with background gases of nitrogen, argon, andair at a pressure of one bar. We compared our data with numerical models ofdiffusion-limited growth based on cellular automata to extract surface growthparameters at different temperatures and supersaturations. These data representa first step toward obtaining precision ice growth measurements as a functionof temperature, supersaturation, background gas pressure and gas constituents.  From these investigations we hope to better understand the surface moleculardynamics that determine crystal growth rates and growth morphologies.

Measurements of Snow Crystal Growth Dynamics in a Free-fall Convection Chamber