CO2冰中CH4的热脱附
Thermal desorption of CH4 retained in CO2 ice
摘要：
已知二氧化碳冰存在于不同的天体物理环境中。尽管如此，它的物理性质（结构，密度，折射率）并没有像水冰那样被广泛研究。因此，研究这种冰在与天体物理环境有关的条件下的吸附特性具有重要的价值。在本文中，我们探讨的可能性，CO2陷阱相关分子在天体物理环境中的温度高于预期的特征升华点。为了实现这一目标，我们进行了解吸实验，在高真空条件下的石英晶体微量天平的基础上，另外监测与四极质谱仪。从我们的研究结果，在某些天体物理的情况下，在升华温度以上的固相CH4的存在下，可以解释的几个保留机制有关的CO2冰的结构的存在。
英文摘要：
CO2 ices are known to exist in different astrophysical environments. In spite of this, its physical properties (structure, density, refractive index) have not been as widely studied as those of water ice. It would be of great value to study the adsorption properties of this ice in conditions related to astrophysical environments. In this paper, we explore the possibility that CO2 traps relevant molecules in astrophysical environments at temperatures higher than expected from their characteristic sublimation point. To fulfil this aim we have carried out desorption experiments under High Vacuum conditions based on a Quartz Crystal Microbalance and additionally monitored with a Quadrupole Mass Spectrometer. From our results, the presence of CH4 in the solid phase above the sublimation temperature in some astrophysical scenarios could be explained by the presence of several retaining mechanisms related to the structure of CO2 ice.
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