太空中的大型生命前分子：乙酸及其异构体的光物理学
Large prebiotic molecules in space: photo-physics of acetic acid and its isomers
摘要：
越来越多的大分子已在太空中得到确认。这些分子中有许多具有生物学意义，因此提供了对原行星状星云中生物前有机化学的深入了解。在这些分子中，乙酸是特别重要的，因为它的结构接近甘氨酸，最简单的氨基酸。用密度泛函理论计算了乙酸及其异构体甲酸甲酯和乙醇醛的电子和振动性质。从计算的光吸收截面，我们得到相应的光吸收率为太阳辐射在1 AU，并发现他们与以前的估计很好的协议。我们还讨论了乙醇醛在Sgr B2（N）中的扩散发射，这与甲酸甲酯和乙酸的发射相反，它们似乎集中在致密区域Sgr B2（N-LMH）中。
英文摘要：
An increasing number of large molecules have been positively identified in space. Many of these molecules are of biological interest and thus provide insight into prebiotic organic chemistry in the protoplanetary nebula. Among these molecules, acetic acid is of particular importance due to its structural proximity to glycine, the simplest amino acid. We compute electronic and vibrational properties of acetic acid and its isomers, methyl formate and glycolaldehyde, using density functional theory. From computed photo-absorption cross-sections, we obtain the corresponding photo-absorption rates for solar radiation at 1 AU and find them in good agreement with previous estimates. We also discuss glycolaldehyde diffuse emission in Sgr B2(N), as opposite to emissions from methyl formate and acetic acid that appear to be concentrate in the compact region Sgr B2(N-LMH).
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