论文标题
固态甲酰胺的LYα辐照
Lyα irradiation of solid-state formamide
论文作者
论文摘要
甲酰胺（NH $ _2 $ CHO）是一种潜在的益生元前体，已提议在我们星球上生命的起源背景下发挥重要作用。在空间的不同环境中观察到了这一点，包括原始区域和彗星。可以通过将形成和破坏数据纳入天体化学模型中，可以更好地理解NH $ _2 $ CHO的丰度和稳定性。我们进行了一项实验研究，研究了纯NH $ _2 $ CHO ICE在12 K时通过LY $α$（121.6 nm）光子的相互作用的破坏。 NH $ _2 $ CHO的UV照片破坏是使用傅立叶转换红外光谱研究的。紫外线处理后，NH $ _2 $ CHO IR频段的强度减少，与HCN，CO，NH $ _4^+$ OCN $^ - $，HNCO和CO $ _2 $相对应的新频段出现在频谱中。衍生了破坏和累积产物形成横截面。不同能量加工剂的横截面中横截面的破坏率的比较表明，紫外线光子会导致NH $ _2 $ CHO破坏的数量级比宇宙射线高，但三个比H原子低的数量级。
Formamide (NH$_2$CHO), a potential prebiotic precursor, has been proposed to play an important role in the context of origin of life on our planet. It has been observed in different environments in space including the protostellar regions and comets. The abundance and stability of NH$_2$CHO in the early stages of star formation can be better understood by incorporating the formation and destruction data in the astrochemical models. We carried out an experimental investigation to study the destruction of pure NH$_2$CHO ice at 12 K by the interaction of Ly$α$ (121.6 nm) photons. The UV photo destruction of NH$_2$CHO was studied using Fourier-transform infrared spectroscopy. After UV processing, the intensity of NH$_2$CHO IR bands decreases and new bands corresponding to HCN, CO, NH$_4^+$ OCN$^-$, HNCO, and CO$_2$ appeared in the spectrum. Destruction and cumulative product formation cross-sections were derived. The comparison of destruction rate derived from the cross-section in cold and dense molecular cloud for different energetic processing agents, reveals that UV photons induces an order of magnitude higher NH$_2$CHO destruction than cosmic rays, but three orders of magnitude lower than for H atoms.
