土卫六上笼形物捕获惰性气体的理论研究
A theoretical investigation into the trapping of noble gases by clathrates on Titan
摘要：
在本文中，我们使用统计热力学的方法来量化的效率与土卫六表面上的笼形物陷阱惰性气体。我们认为不同的价值观的Ar，Kr，CH4，C2H6和N2的丰度在气相中，可能是代表土卫六的早期大气。我们讨论的各种参数，选择代表在我们的计算中的客体物种和冰笼之间的相互作用的效果。我们还讨论了不同大小的笼形笼的结果。我们表明，笼形物的捕获效率是足够高的显着降低大气中的浓度的Kr，在较小程度上，Kr，无论初始的气相组成，只要这些笼形物是足够丰富的土卫六的表面上。相比之下，我们发现，氩被困在笼形物，因此，大气中的氩丰度应保持几乎恒定。我们的结论是，通过包合捕获稀有气体的机制可以解释惠更斯在土卫六的大气中观察到的原始氘和氪的不足，但这种机制不足以解释Ar的不足。
英文摘要：
In this paper, we use a statistical thermodynamic approach to quantify the efficiency with which clathrates on the surface of Titan trap noble gases. We consider different values of the Ar, Kr, Xe, CH4, C2H6 and N2 abundances in the gas phase that may be representative of Titan's early atmosphere. We discuss the effect of the various parameters that are chosen to represent the interactions between the guest species and the ice cage in our calculations. We also discuss the results of varying the size of the clathrate cages. We show that the trapping efficiency of clathrates is high enough to significantly decrease the atmospheric concentrations of Xe and, to a lesser extent, of Kr, irrespective of the initial gas phase composition, provided that these clathrates are abundant enough on the surface of Titan. In contrast, we find that Ar is poorly trapped in clathrates and, as a consequence, that the atmospheric abundance of argon should remain almost constant. We conclude that the mechanism of trapping noble gases via clathration can explain the deficiency in primordial Xe and Kr observed in Titan's atmosphere by Huygens, but that this mechanism is not sufficient to explain the deficiency in Ar.
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