热处理和电子辐照CO2天体物理冰类似物的中红外和VUV光谱特性
Mid-IR and VUV Spectroscopic Characterisation of Thermally Processed and Electron Irradiated CO2 Astrophysical Ice Analogues
摘要：
由于CO2在整个星际介质和太阳系中的普遍存在，以及它作为合成更大，更复杂的有机分子的碳原料的可能性，CO2冰类似物的天体化学一直是深入研究的主题。为了准确地辨别CO2在其中发挥作用的物理化学过程，有必要将实验室生成的光谱与地面和空间望远镜获得的观测数据进行比较。已知影响这种光谱的出现的关键因素是温度，特别是当在红外和紫外中获得光谱时。在本研究中，我们描述了一个系统的调查研究结果：（一）热退火对中红外和真空紫外吸收光谱的纯，未照射的CO2天体物理冰类似物在不同温度下制备的影响，和（ii）温度对化学产品的电子辐照类似冰的影响。我们的研究结果表明，中红外和真空紫外光谱的纯CO2冰是敏感的结构和化学变化引起的热退火。此外，使用中红外光谱，我们已经成功地确定了生产的辐射分解的子分子作为一个结果，1千电子伏的电子辐照和温度的影响，在此化学。这些结果可直接用于研究星际冰、彗星和冰冷的月球物体的化学性质，也可作为未来观测任务的参考数据。
英文摘要：
The astrochemistry of CO2 ice analogues has been a topic of intensive investigation due to the prevalence of CO2 throughout the interstellar medium and the Solar System, as well as the possibility of it acting as a carbon feedstock for the synthesis of larger, more complex organic molecules. In order to accurately discern the physico-chemical processes in which CO2 plays a role, it is necessary to have laboratory-generated spectra to compare against observational data acquired by ground- and space-based telescopes. A key factor which is known to influence the appearance of such spectra is temperature, especially when the spectra are acquired in the infrared and ultraviolet. In this present study, we describe the results of a systematic investigation looking into: (i) the influence of thermal annealing on the mid-IR and VUV absorption spectra of pure, unirradiated CO2 astrophysical ice analogues prepared at various temperatures, and (ii) the influence of temperature on the chemical products of electron irradiation of similar ices. Our results indicate that both mid-IR and VUV spectra of pure CO2 ices are sensitive to the structural and chemical changes induced by thermal annealing. Furthermore, using mid-IR spectroscopy, we have successfully identified the production of radiolytic daughter molecules as a result of 1 keV electron irradiation and the influence of temperature over this chemistry. Such results are directly applicable to studies on the chemistry of interstellar ices, comets, and icy lunar objects and may also be useful as reference data for forthcoming observational missions.
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