UV irradiation of polycyclic aromatic hydrocarbons in ices: Production of alcohols, quinones, and ethers
UV irradiation of polycyclic aromatic hydrocarbons in ices: Production of alcohols, quinones, and ethers
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DOI：
10.1126/science.283.5405.1135
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发表时间：
1999-02-19
期刊：
影响因子：
56.9
通讯作者：
Zare, RN
中科院分区：
文献类型：
--
作者：
Bernstein, MP;Sandford, SA;Zare, RN
在天体物理条件下，将水冰中的多环芳烃（PAHs）暴露于紫外线（UV）辐射下，并用红外光谱和质谱分析了产物。外围碳原子被氧化，生成芳香醇、酮类；醚和还原，产生部分氢化的芳香烃，这些分子解释了星际3.4微米的发射特征。这类化合物都存在于碳质陨石中。氢和氘原子很容易在多环芳烃和冰之间交换，这可能解释了在某些陨石分子中发现的氘富集。这项工作对地外有机物的生物发生具有重要意义。
Polycyclic aromatic hydrocarbons (PAHs) in water ice were exposed to ultraviolet (UV) radiation under astrophysical conditions, and the products were analyzed by infrared spectroscopy and mass spectrometry. Peripheral carbon atoms were oxidized, producing aromatic alcohols, ketones; and ethers, and reduced, producing partially hydrogenated aromatic hydrocarbons, molecules that account for the interstellar 3.4-micrometer emission feature. These classes of compounds are all present in carbonaceous meteorites. Hydrogen and deuterium atoms exchange readily between the PAHs and the ice, which may explain the deuterium enrichments found in certain meteoritic molecules. This work has important implications for extraterrestrial organics in biogenesis.