Cryogenic Synthesis of Molecules of Astrobiological Interest: Catalytic Role of Cosmic Dust Analogues
Cryogenic Synthesis of Molecules of Astrobiological Interest: Catalytic Role of Cosmic Dust Analogues
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天体生物学分子的低温合成：宇宙尘埃类似物的催化作用
DOI：
10.1007/s11084-006-9050-5
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发表时间：
2007
影响因子：
2
通讯作者：
L. Colangeli
中科院分区：
文献类型：
--
作者：
J. Brucato;G. Strazzulla;G. Baratta;A. Rotundi;L. Colangeli
我们研究了非晶态橄榄石(MgFeSiO4)宇宙尘埃类似物(CDAs)在200keV质子辐照甲酰胺(NH2COH)后合成分子中的作用。在20℃下将甲酰胺沉积在橄榄石衬底上，比较了甲酰胺纯(即沉积在惰性硅衬底上)在12EV/16Amu辐照剂量下形成的新分子物种和沉积在CDAS上的新分子物种的丰度。具体来说，无定形橄榄石是一种选择性催化剂，可以防止NH3和CN−分子的形成，并改变CO、CO、HNCO、CO的相对丰度。我们已经证明，在模拟天文环境中发生的过程的实验中，必须考虑CDA的作用。
We have studied the effects of the substrate, namely amorphous olivine (MgFeSiO4) cosmic dust analogues (CDAs), in synthesis of molecules obtained after 200 keV proton irradiation of formamide (NH2COH). Formamide has been deposited on the olivine substrate at 20 K. The abundances of new molecular species formed after an irradiation dose of 12 eV/16 amu in formamide pure (i.e. deposited on an inert silicon substrate) and deposited on CDAs have been compared. Specifically, MgFeSiO4amorphous olivine is a selective catalyst preventing formation of NH3and CN−molecules and changing the relative abundances of, CO2, HNCO, CO. We have shown that the role of CDAs has to be taken into account in experiments simulating processes occurring in astronomical environments.