2:00 PM - 2:15 PM
[PPS09-02] In-situ observation of heterogeneous nucleation of ice by ultrahigh-vacuum transmission electron microscope
Keywords:ice, heterogeneous nucleation, crystal, amorphous, morphology
We found that at higher temperatures large islands of crystalline ice Ic were formed, and that with decreasing temperatures size and numbers of islands becomes smaller and larger, respectively. At temperatures below critical temperatures, uniform amorphous thin films were formed. The critical temperature on crystalline substrate (Al) is around 100 K, while those on amorphous substrates 125-130 K. These experimental results show the necessity of reinvestigation on the discussion of crystallinity of ices condensed in space (Kouchi et al., 1994) and collision-sticking process of icy grains.