The Phase of Water Ice Which Forms in Cold Clouds in the Mesospheres of Mars, Venus, and Earth
The Phase of Water Ice Which Forms in Cold Clouds in the Mesospheres of Mars, Venus, and Earth
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DOI：
10.1029/2020je006796
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发表时间：
2021-03-01
影响因子：
4.8
通讯作者：
Murray, B. J.
中科院分区：
文献类型：
--
作者：
Mangan, T. P.;Plane, J. M. C.;Murray, B. J.
水冰云在太阳系(最有可能是在其他地方)的类地行星的中间层中，通过低气压和低温度下的蒸汽沉积形成。在这些条件下，可能会形成一系列结晶态和非晶态冰。该相很重要，因为它影响成核动力学、密度、固体上的蒸汽压、生长速度和颗粒形状。在过去，这些不同阶段存在的温度范围是基于在低温下沉积冰并在观察相变化的同时使其升温来定义的。然而，在与类地行星相关的温度范围内，冰的直接沉积还没有得到系统的研究。本文介绍了在真空室中88~145K温度区间内沉积的水冰的X射线衍射测量结果。X-射线衍射谱显示低密度无定形冰形成于
Water ice clouds form in the mesospheres of terrestrial planets in the solar system (and most likely elsewhere) by vapor deposition at low pressures and temperatures. Under these conditions a range of crystalline and amorphous phases of ice might form. The phase is important because it influences nucleation kinetics, density, vapor pressure over the solid, growth rates and particle shape. In the past, the temperature range over which these different phases exist has been defined on the basis of depositing ice at low temperature and warming it while observing phase changes. However, the direct deposition of ice at a range of temperatures relevant for the terrestrial planets has not been systematically investigated. Here we present X-ray Diffraction (XRD) measurements of water ice deposited at temperature intervals between 88 and 145 K in a vacuum chamber. XRD patterns showed that low density amorphous ice was formed at