The nucleation behavior of supersaturated water vapor in helium is experimentally investigated in the temperature range of 200–240 K. The experiments are performed using a pulse expansion wave tube. The experimental results show a sharp transition in the nucleation rates at 207 K. We suggest that the transition is due to the transition of vapor/liquid to vapor/solid nucleation (ordered with decreasing temperature). A qualitative theoretical explanation is given based on the classical nucleation theory and the surface energy of ice.
Peeters, P., Gielis, J. J. H., & Dongen, van, M. E. H. (2002). The nucleation behavior of supercooled water vapor in helium. Journal of Chemical Physics, 117(12), 5647-5653. https://doi.org/10.1063/1.1501885