论文标题
关于星际谷物冰的溅射
On Modelling Sputtering of Interstellar Grain Ices
论文作者
论文摘要
在星际培养基（ISM）中，复杂有机分子（COM）的形成在很大程度上是通过表面反应促进的。但是，在冷乌云中，由于缺乏克服与晶粒表面的结合能的热能，因此COM的热解吸效率低下。因此，非热解吸方法是主要在晶粒上形成的许多COM的气相检测的重要解释。在这里，我们提出了一个新的非热解过程：基于水，二氧化碳和简单的混合冰的谷物冰表面的宇宙射线溅射。我们的模型应用估计的溅射速率对3相速率方程模型Nautilus-1.1，其中此包含会导致粒子反应（例如甲醇（CH $ _ {3} $ OH）和甲基甲酸盐）和甲基甲酸盐（HCOOCH $ _ {3} $）产生的分子的气相丰度增强。值得注意的是，与其他分子相比，具有高效气相破坏途径的物种显示出溅射模型的增加较小。这些模型结果表明，溅射是一种有效的，非特异性的非热解吸方法，应被视为将来化学模型的重要因素。
In the interstellar medium (ISM), the formation of complex organic molecules (COMs) is largely facilitated by surface reactions. However, in cold dark clouds, thermal desorption of COMs is inefficient because of the lack of thermal energy to overcome binding energies to the grain surface. Non-thermal desorption methods are therefore important explanations for the gas-phase detection of many COMs that are primarily formed on grains. Here we present a new non-thermal desorption process: cosmic ray sputtering of grain ice surfaces based on water, carbon dioxide, and a simple mixed ice. Our model applies estimated rates of sputtering to the 3-phase rate equation model Nautilus-1.1, where this inclusion results in enhanced gas phase abundances for molecules produced by grain reactions such as methanol (CH$_{3}$OH) and methyl formate (HCOOCH$_{3}$). Notably, species with efficient gas phase destruction pathways exhibit less of an increase in models with sputtering compared to other molecules. These model results suggest that sputtering is an efficient, non-specific method of non-thermal desorption that should be considered as an important factor in future chemical models.
