论文标题
非能氢原子渗透到无定形固体中，它们与嵌入苯和萘的反应
Penetration of Non-energetic Hydrogen Atoms into Amorphous Solid Water and their Reaction with Embedded Benzene and Naphthalene
论文作者
论文摘要
冰冷晶粒表面上的化学过程在分子云中化学演化中起重要作用。特别是，已经广泛研究了涉及从气相产生的非能氢原子的反应。人们认为这些反应仅在冰颗粒的表面上有效地进行。因此，嵌入冰壳中的分子不被认为与氢原子反应。最近，Tsuge等。 （2020年）提出，即使通过扩散氢化，非能源氢原子也可以在冰盖中与CO分子反应。该研究扩展到本研究中嵌入无定形固体水（ASW）中的苯和萘分子，该研究表明，这些分子的一部分可以在天体物理环境中完全氢化。使用苯分子分别确定非能氢原子在多孔和非孔ASW中的渗透深度分别为> 50和〜10单层（1单层〜0.3 nm）。
Chemical processes on the surface of icy grains play an important role in the chemical evolution in molecular clouds. In particular, reactions involving non-energetic hydrogen atoms accreted from the gaseous phase have been extensively studied. These reactions are believed to effectively proceed only on the surface of the icy grains; thus, molecules embedded in the ice mantle are not considered to react with hydrogen atoms. Recently, Tsuge et al. (2020) suggested that non-energetic hydrogen atoms can react with CO molecules even in ice mantles via diffusive hydrogenation. This investigation was extended to benzene and naphthalene molecules embedded in amorphous solid water (ASW) in the present study, which revealed that a portion of these molecules could be fully hydrogenated in astrophysical environments. The penetration depths of non-energetic hydrogen atoms into porous and non-porous ASW were determined using benzene molecules to be >50 and ~10 monolayers, respectively (1 monolayer ~ 0.3 nm).
