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arXiv 1606.03058astro-ph.GA
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混合CO2-CH3OH类星际冰的THz时域光谱

THz Time-Domain Spectroscopy of Mixed CO2-CH3OH Interstellar Ice Analogs

Brett A. McGuire, Sergio Ioppolo, Marco A. Allodi, Geoffrey A. Blake

摘要:

星际尘埃颗粒的冰冷地幔是原始生命前分子库存的发源地,这些分子库存最终可能为新生的太阳系以及其中形成的行星和星子提供种子。在这里,我们提出了一个研究的两个最丰富的物种在这些冰后水:二氧化碳(CO2)和甲醇(CH3OH)使用太赫兹(THz)时域光谱和中红外光谱。我们研究这些物种的纯冰和混合冰,并展示了太赫兹光谱区域的功率,以阐明冰的长程结构(即结晶与非晶),冰内这些物种的分离程度,以及冰内物种的热历史。最后,我们评论的效用产生的太赫兹转换,这些冰用于天文观测星际冰。

英文摘要:

The icy mantles of interstellar dust grains are the birthplaces of the primordial prebiotic molecular inventory that may eventually seed nascent solar systems and the planets and planetesimals that form therein. Here, we present a study of two of the most abundant species in these ices after water: carbon dioxide (CO2) and methanol (CH3OH) using TeraHertz (THz) time-domain spectroscopy and mid-infrared spectroscopy. We study pure and mixed-ices of these species, and demonstrate the power of the THz region of the spectrum to elucidate the long-range structure (i.e. crystalline versus amorphous) of the ice, the degree of segregation of these species within the ice, and the thermal history of the species within the ice. Finally, we comment on the utility of the THz transitions arising from these ices for use in astronomical observations of interstellar ices.

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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