论文标题
泰坦条件下乙烯蒸发岩的实验研究
Experimental Study of Ethylene Evaporites under Titan Conditions
论文作者
论文摘要
卡西尼（Cassini）证实，泰坦（Titan）有大量的湖泊和海洋。这些液体的主要成分包括甲烷（$ ch_4 $）和乙烷（$ C_2H_6 $）；但是，有证据表明，湖泊中也可能存在诸如乙烯（$ C_2H_4 $）之类的次要组成部分。随着湖泊水平下降，落在地球上的5 $ $ $ abright沉积物（类似于蒸发物沉积物）被留在后面。在这里，我们通过使用能够再现泰坦表面条件的泰坦模拟室（89-94 K，1.5 bar $ n_2 $）来提供饱和值，蒸发速率和对乙烯蒸发形成的限制。使用傅立叶变换红外光谱，质量和温度读数分析实验样品。在甲烷溶剂中比在乙烷溶剂或甲烷/乙烷的混合物中更快地形成乙烯。我们测量的平均蒸发率为$（2.8 \ pm 0.3）\ times 10^{ - 4} kg \; m^{ - 2} \;甲烷的s^{ - 1} $，平均上限蒸发率小于$ 5.5 \ times 10^{ - 6} kg \; m^{ - 2} \; S^{ - 1} $用于Ethane。此外，我们观察到1.630和2.121 $μm$的乙烯吸收带的红移，以及1.666 $μm$的甲烷带的持久性。
Titan has an abundance of lakes and seas, as confirmed by Cassini. Major components of these liquid bodies include methane ($CH_4$) and ethane ($C_2H_6$); however, evidence indicates that minor components such as ethylene ($C_2H_4$) may also exist in the lakes. As the lake levels drop, 5 $μm$-bright deposits, resembling evaporite deposits on earth, are left behind. Here, we provide saturation values, evaporation rates, and constraints on ethylene evaporite formation by using a Titan simulation chamber capable of reproducing Titan surface conditions (89-94 K, 1.5 bar $N_2$). Experimental samples were analyzed using Fourier transform infrared spectroscopy, mass, and temperature readings. Ethylene evaporites form more quickly in a methane solvent than in an ethane solvent or in a mixture of methane/ethane. We measured an average evaporation rate of $(2.8 \pm 0.3) \times 10^{-4} kg \; m^{-2} \; s^{-1}$ for methane and an average upper limit evaporation rate of less than $5.5 \times 10^{-6} kg \; m^{-2} \; s^{-1}$ for ethane. Additionally, we observed red shifts in ethylene absorption bands at 1.630 and 2.121 $μm$ and the persistence of a methane band at 1.666 $μm$.
