Laboratory experiments to unveil the molecular reactivity occurring during the processing of ices in the protosolar nebula
Laboratory experiments to unveil the molecular reactivity occurring during the processing of ices in the protosolar nebula
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DOI：
10.1016/j.epsl.2019.116011
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发表时间：
2020-02-01
影响因子：
5.3
通讯作者：
d'Hendecourt, L. S.
中科院分区：
文献类型：
--
作者：
Gautier, T.;Danger, G.;d'Hendecourt, L. S.
通过实验室实验，我们研究了光降解和热降解在可能的有机物络合机制中的作用，这些有机物可能起源于太阳系形成之前或形成期间的星际冰。我们对星际介质（ISM）脏冰实验室类似物的光化学和热化学变化形成的有机残留物进行了高分辨率轨道阱质谱分析。我们在分子水平上探索了原太阳星云内部对这些有机耐火材料的组成和结构的可能影响，这些有机耐火材料是从天体物理冰的初始冰组成中获得的。我们表明，氮的掺入，通过与碳的竞争，对残留物的最终组成有很大的影响。富NH3的冰在最终残渣中产生一组不饱和分子，而富H2O的冰产生一组饱和分子。最后，我们观察并讨论了紫外辐射对有机物脱羧的强烈影响，并讨论了这一结果对原太阳星云的潜在意义。(C) 2019 Elsevier B.V.版权所有
Using laboratory experiments, we investigate the role of photo and thermal degradation in the possible complexification mechanisms of organic matter that may originate from interstellar ices prior to, or during the formation of the Solar System. We perform High Resolution Orbitrap Mass Spectrometry on organic residues formed from the photo- and thermochemical alterations of Interstellar Medium (ISM) dirty ice laboratory analogues. We probe, at the molecular level, the possible effects within the protosolar nebula on the composition and structure of these organic refractory materials obtained from an initial ice composition representative of astrophysical ices. We show that nitrogen incorporation, by competing with the carbon, has a strong influence on the final composition of the residue. NH3 rich ices lead to a group of unsaturated molecules in the final residue, while H2O rich ices lead to saturated ones. Finally, we observe and discuss the strong effect of UV irradiation on the decarboxylation on organic matter and discuss potential implications of this result for the protosolar nebula. (C) 2019 Elsevier B.V. All rights reserved.