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en: Three-Step Growth of Vapor-Deposited Ice under Mesospheric Temperature and Water Vapor Conditions.

en: Polar mesospheric clouds provide clues to physicochemical processes in the mesosphere and lower thermosphere. However, the heterogeneous nucleation and growth processes of water ice under polar mesospheric conditions are poorly understood, especially at the nanoscale. This study used reflection high-energy electron diffraction and infrared reflection-absorption spectroscopy to analyze the structure of vapor-deposited ice at polar mesospheric temperature (120 K) under vapor pressure (10-6 Pa) conditions. The ice appeared to grow in three steps during vapor deposition, being amorphous water for the first 15 nm, then cubic ice up to 50 nm, and finally hexagonal ice subsequently. This three-step growth suggests that the three observed phases can coexist in polar mesospheric clouds, depending on the thickness of water ice. The finding of the three-step growth also shows that the Ostwald rule of stages can hold for vapor-deposited ice at low temperature.

en: The Journal of Physical Chemistry Letters


en: Infrared Band Strengths of Dangling OH Features in Amorphous Water at 20 K

en: The Astrophysical Journal

ja: The Astrophysical Journal


en: Structure of crystalline water ice formed through neon matrix sublimation under cryogenic and vacuum conditions

en: The Journal of Chemical Physics

ja: The Journal of Chemical Physics


en: Absolute Absorption Cross Section and Orientation of Dangling OH Bonds in Water Ice

en: The Astrophysical Journal Letters

ja: The Astrophysical Journal Letters