论文标题
在升高温度下，嵌入无定形固体水中的CO的扩散氢化反应〜70 K
Diffusive hydrogenation reactions of CO embedded in amorphous solid water at elevated temperatures ~70 K
论文作者
论文摘要
星际尘埃上的表面过程在分子云中的化学演化中具有重要作用。已经对冰面上的氢化反应进行了广泛的研究，并在低温下进行的低于20 K的低温进行。相比之下，缺乏有关冰壳内分子化学过程的信息。在这项工作中，我们研究了嵌入在非晶固水中（ASW）中的碳一氧化碳（CO）的扩散氢化反应作为模型案例，发现CO的氢化有效地会产生H2CO和CH3OH，甚至在CO被埋葬在ASW以下时，甚至在20 K以上都会产生20 K以上。实验结果表明，氢原子通过ASW的裂缝扩散，并且有足够的停留时间与嵌入式CO反应。即使在高达〜70 K的温度下也会发生氢反应。裂纹在高温下的裂纹崩溃，但氢化反应的发生在氢反应的发生时意味着裂缝不会完全消失，并保持足够的渗透率，以渗透到水中的渗透率上。考虑到实验室和分子云中的氢原子的通量，我们建议在天体物理环境中氢及其反应的渗透及其反应发生。统一的天文学
The surface processes on interstellar dust grains have an important role in the chemical evolution in molecular clouds. Hydrogenation reactions on ice surfaces have been extensively investigated and are known to proceed at low temperatures mostly below 20 K. In contrast, information about the chemical processes of molecules within an ice mantle is lacking. In this work, we investigated diffusive hydrogenation reactions of carbon monoxide (CO) embedded in amorphous solid water (ASW) as a model case and discovered that the hydrogenation of CO efficiently proceeds to yield H2CO and CH3OH even above 20 K when CO is buried beneath ASW. The experimental results suggest that hydrogen atoms diffuse through the cracks of ASW and have a sufficient residence time to react with embedded CO. The hydrogenation reactions occurred even at temperatures up to ~70 K. Cracks collapse at elevated temperatures but the occurrence of hydrogenation reactions means that the cracks would not completely disappear and remain large enough for penetration by hydrogen atoms. Considering the hydrogen-atom fluence in the laboratory and molecular clouds, we suggest that the penetration of hydrogen and its reactions within the ice mantle occur in astrophysical environments. Unified Astronomy
