arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.06681astro-ph.SRastro-ph.GA
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模拟星际冰中碳原子反应的低温冰装置

A cryogenic ice setup to simulate carbon atom reactions in interstellar ices

D. Qasim, M. J. A. Witlox, G. Fedoseev, K. -J. Chuang, T. Banu, S. A. Krasnokutski, S. Ioppolo, J. Kastner, E. F. van Dishoeck, H. Linnartz

摘要:

讨论了一种用于研究分子云中星际冰固态反应路线的定制碳原子束源的设计、实现和性能。该源集成到现有的超真空装置,表面反应模拟装置(SURFRESIDE $^{2}$),扩展了这个双原子(H/D,O和N)光束线装置与第三个原子(C)光束线的一个独特的系统,是完全适合于探索复杂的有机分子固态形成的代表性星际云条件下。讨论了该系统的参数空间,其中包括碳原子撞击冰样品的通量,它们的温度,以及温度对冰反应的潜在影响。为了减少装置内部的碳污染,已经投入了大量的努力来将光束尺寸限制在样品尺寸的限制内。通过实例实验C + $^{18}$ O $_2$定量研究了C原子束的性能,并得到了计算得出的激活势垒的支持。讨论了该源通过C原子反应研究星际复杂有机分子固态形成的潜力。

英文摘要:

The design, implementation, and performance of a customized carbon atom beam source for the purpose of investigating solid-state reaction routes in interstellar ices in molecular clouds are discussed. The source is integrated into an existing ultrahigh vacuum setup, SURFace REaction SImulation DEvice (SURFRESIDE$^{2}$), which extends this double atom (H/D, O, and N) beamline apparatus with a third atom (C) beamline to a unique system that is fully suited to explore complex organic molecule solid-state formation under representative interstellar cloud conditions. The parameter space for this system is discussed, which includes the flux of the carbon atoms hitting the ice sample, their temperature, and the potential impact of temperature on ice reactions. Much effort has been put into constraining the beam size to within the limits of the sample size with the aim to reduce carbon pollution inside the setup. How the C-atom beam performs is quantitatively studied through the example experiment, C + $^{18}$O$_2$, and supported by computationally-derived activation barriers. The potential for this source to study the solid-state formation of interstellar complex organic molecules through C-atom reactions is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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