论文标题
由混合原子和分子种类形成的硅酸盐和碳质固体在霓虹灯冰中扩散
Separate silicate and carbonaceous solids formed from mixed atomic and molecular species diffusing in neon ice
论文作者
论文摘要
通过退火退火，在实验中研究了先前存在的固定间灰尘纹理表面上的耐火材料问题的形成和生长，其中潜在的硅酸盐晶粒（MG和Fe Atoms，Sio和Sio $ $ _2 $ _2 $分子）和固体碳（C $ _N $ _N $ Molecules，$ n $ n $ n $ n $ n $ n $ = 2-10）。其他分子，主要是o $ _3 $，co，co $ _2 $，c $ _3 $ o和h $ _2 $ o，同时嵌入了矩阵中。退火过程导致冷掺杂剂在霓虹灯冰中扩散并相互作用。用红外光谱监测该过程的原位显示，在低于13 K的温度下，氧化硅和碳分子的消失以及硅酸盐的Si-O拉伸带的上升。事前电子显微镜证实了硅酸盐晶粒的形成，并表明它们的结构是无定形的。这也表明，在硅酸盐谷物旁边同时形成了无定形碳物质，两种材料是化学分离的。实验的结果支持以下假设：正如天文观测和宇宙尘埃质量的演化模型所暗示的，在冷ISM中重新形成了复杂硅酸盐和碳质材料的晶粒。此外，他们表明一种材料的潜在前体与低温温度下的另一种材料没有结合，这为我们提供了关于星际晶粒中硅酸盐和碳分离的线索。
The formation and growth of refractory matter on pre-existing interstellar dust grain surfaces was studied experimentally by annealing neon-ice matrices in which potential precursors of silicate grains (Mg and Fe atoms, SiO and SiO$_2$ molecules) and of solid carbon (C$_n$ molecules, $n$ = 2-10) were initially isolated. Other molecules, mainly O$_3$, CO, CO$_2$, C$_3$O, and H$_2$O, were embedded at the same time in the matrices. The annealing procedure caused the cold dopants to diffuse and interact in the neon ice. Monitoring the procedure in situ with infrared spectroscopy revealed the disappearance of the silicon oxide and carbon molecules at temperatures lower than 13 K, and the rise of the Si-O stretching band of silicates. Ex situ electron microscopy confirmed the formation of silicate grains and showed that their structure was amorphous. It also showed that amorphous carbon matter was formed simultaneously next to the silicate grains, the two materials being chemically separated. The results of the experiments support the hypothesis that grains of complex silicates and of carbonaceous materials are re-formed in the cold ISM, as suggested by astronomical observations and evolution models of cosmic dust masses. Moreover, they show that the potential precursors of one material do not combine with those of the other at cryogenic temperatures, providing us with a clue as to the separation of silicates and carbon in interstellar grains.
