High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth.

High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth.
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DOI:
10.1038/s41598-017-06489-1
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发表时间:
2017-07-24
期刊:
影响因子:
4.6
通讯作者:
Civiš S
Civiš S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ferus M;Kubelík P;Knížek A;Pastorek A;Sutherland J;Civiš S

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最近在益生元化学方面的研究结果表明,氰化氢(HCN)是合成核苷酸、氨基酸和脂质构建块的碳和氮的来源。在撞击事件中,通过对来自撞击体和大气的碳质和含氮物质进行后处理,可以产生HCN;它也可以由这些材料通过放电产生。在这里,我们研究了高能事件对一系列代表各种大气-撞击物挥发性组合的起始混合物的影响。使用连续扫描时间分辨光谱法,我们检测到·CN自由基和激发CO是最初最丰富的产物。氰基自由基和受激发的一氧化碳分子是反应性的,能量丰富的物种,但由于有利的弗兰克-康登因子,它们具有弹性。这些最初形成的激发态物种的后续反应导致基态益生元的产生,主要是HCN。
Recent results in prebiotic chemistry implicate hydrogen cyanide (HCN) as the source of carbon and nitrogen for the synthesis of nucleotide, amino acid and lipid building blocks. HCN can be produced during impact events by reprocessing of carbonaceous and nitrogenous materials from both the impactor and the atmosphere; it can also be produced from these materials by electrical discharge. Here we investigate the effect of high energy events on a range of starting mixtures representative of various atmosphere-impactor volatile combinations. Using continuously scanning time–resolved spectrometry, we have detected ·CN radical and excited CO as the initially most abundant products. Cyano radicals and excited carbon monoxide molecules in particular are reactive, energy-rich species, but are resilient owing to favourable Franck–Condon factors. The subsequent reactions of these first formed excited species lead to the production of ground-state prebiotic building blocks, principally HCN.
DOI: 10.1016/j.icarus.2012.07.032
发表时间: 2012-11-01
期刊: ICARUS
影响因子: 3.2
作者:
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DOI: 10.1021/jp211772d
发表时间: 2012-03-29
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