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An experimental investigation of the effects of irradiation on carbon- and oxygen-bearing species in interstellar ices.

机译：对星际冰中辐射对含碳和氧物种的影响进行实验研究。

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Understanding the irradiation effects on interstellar ices is important for several reasons. It can help us understand the chemical inventory of the primordial ices which formed our solar system. The chemical diversity of these ices is reflected in the composition of the icy bodies they evolve into; including comets, Kuiper Belt Objects, and interplanetary dust particles. Each of these represents a source of water as well as biologically important precursors that could potentially seed the Earth. The molecules which are constituents of these ices are relatively simple chemical species. However, during the long lifetimes of interstellar clouds they are subjected to radiation from Galactic Cosmic Rays, as well as UV radiation from young stellar objects. This radiation induces the formation of new chemical species, as evidenced by the complex chemical species which are detected within hot molecular cores. Here, as new stars begin to form, they heat up surrounding icy grains, causing them to sublime and release the newly formed species. This research is focused on the effects of irradiation on carbon- and oxygen- bearing species using keV electrons, which simulate the effects of secondary electrons produced within the track of cosmic rays. Since the effects of irradiation on pure carbon monoxide and pure carbon dioxide results in the generation of vastly different species; the former generates linear chain species, whereas the latter forms predominantly carbon oxide species. In order to understand the underlying processing, a range of irradiation experiments on carbon oxide ices were conducted where the ratio of C:0 varies from 1 .5: 1 to 1:4.
机译：出于多种原因，了解辐照对星际冰的影响很重要。它可以帮助我们了解形成太阳系的原始冰的化学存量。这些冰的化学多样性反映在它们演变成的冰体的组成中。包括彗星，柯伊伯带天体和行星际尘埃颗粒。这些中的每一个都代表水的来源以及潜在地播种地球的生物学上重要的前体。这些冰的组成分子是相对简单的化学物种。但是，在星际云的长寿命中，它们会受到来自银河宇宙射线的辐射以及来自年轻恒星物体的UV辐射的影响。这种辐射诱导了新化学物种的形成，正如在热分子核中检测到的复杂化学物种所证明的那样。在这里，随着新恒星开始形成，它们会加热周围的冰粒，使其升华并释放出新形成的物种。这项研究的重点是使用keV电子辐照对含碳和氧的物质的影响，该电子模拟了在宇宙射线轨道内产生的二次电子的影响。由于辐射对纯一氧化碳和纯二氧化碳的影响导致产生了截然不同的物种；前者产生线性链物种，而后者主要形成碳氧化物物种。为了理解潜在的过程，在碳冰上进行了一系列辐照实验，其中C：0的比率从1.0.5：1到1：4不等。

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