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arXiv 1503.00703astro-ph.EP
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甲烷-氮二元冰系统的吸收系数:对冥王星的启示

Absorption Coefficients of the Methane-Nitrogen Binary Ice System: Implications for Pluto

S. Protopapa, W. M. Grundy, S. C. Tegler, J. M. Bergonio

摘要:

Prokhvatilov和Yantsevich(1983)的甲烷-氮相图表明,在与冥王星等冰质矮行星表面相关的温度下,有两个相有助于甲烷的分解:氮饱和甲烷$\bf{\bar{N_{2}}}$:CH $_{4}$和甲烷饱和氮$\bf{\bar{CH_{4}}}$:N $_{2}$。没有光学常数是迄今为止,后者的组成部分限制建设一个适当的模型,符合热力学平衡的考虑。新的光学常数的甲烷稀释在氮气中的固溶体(N $_{2}$:CH $_{4}$)和氮气稀释在甲烷中的固溶体(CH $_{4}$:N $_{2}$)在40和90 K之间的温度下,在波长范围1.1-2.7 $μ$在不同的混合比。这些光学常数来自于在封闭单元中从液相生长的晶体的透射测量。本文系统地研究了甲烷和氮气固体混合物光谱特性随混合比和温度的变化。

英文摘要:

The methane-nitrogen phase diagram of Prokhvatilov and Yantsevich (1983) indicates that at temperatures relevant to the surfaces of icy dwarf planets like Pluto, two phases contribute to the methane absorptions: nitrogen saturated with methane $\bf{\bar{N_{2}}}$:CH$_{4}$ and methane saturated with nitrogen $\bf{\bar{CH_{4}}}$:N$_{2}$. No optical constants are available so far for the latter component limiting construction of a proper model, in compliance with thermodynamic equilibrium considerations. New optical constants for solid solutions of methane diluted in nitrogen (N$_{2}$:CH$_{4}$) and nitrogen diluted in methane (CH$_{4}$:N$_{2}$) are presented at temperatures between 40 and 90 K, in the wavelength range 1.1-2.7 $μ$m at different mixing ratios. These optical constants are derived from transmission measurements of crystals grown from the liquid phase in closed cells. A systematic study of the changes of methane and nitrogen solid mixtures spectral behavior with mixing ratio and temperature is presented.

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