太阳系天体有机物质的芳香性与脂肪性

发布时间：2018-01-12 08:25

  本文关键词：太阳系天体有机物质的芳香性与脂肪性　出处：《南昌大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 芳香族碳氢化合物 脂肪族碳氢化合物 红外光谱

【摘要】：“未证认的红外谱带”(“Unidentified Infrared Emission”,UIE)广泛分布于多种天体环境,它们是一组很强的红外发射谱,以3.3、6.2、7.7、8.6和11.3μm五条谱带最为显著,除此之外在3.4、6.85、12.7、16.4、17.4μm处还探测到较弱的发射线。3.3,6.2,7.7,8.6,和11.3μm“未认证红外发射特征”通常归因于多环芳香烃(polycyclic aromatic hydrocarbon,PAH)分子。“未证认的红外谱带”载体模型大都认为3.3μm辐射源于芳香C-H的伸缩振动,若假定3.4μm辐射全部源于脂肪C-H的伸缩振动;我们就可以从3.3和3.4μm发射特征在天体中所观察到的强度估算出UIE载体成分中的脂肪份数(例如脂肪形式中的碳原子份数)。在很多天体中,人们确实同时观测到了3.3μm和3.4μm这两个谱征。本文主要选取了彗星、土卫六、土卫七和土卫八几个天体的光谱图分析计算这几个天体中有机物质的脂肪性和芳香性,其中土卫六光谱中没有3.4μm的光谱特征所以不考虑。另外,也选取了两个光谱图代表银河系星际空间。基于3.3μm为芳香烃结构的C H键拉伸的特征波长,而脂肪烃结构的C H键拉伸的特征波长为3.4μm,本文通过分析大量相关有机分子,我们得到一个平均值A3.3/A3.4≈0.94(A3.4是3.4μm脂肪族的带强度,A3.3是3.3μm芳香族的带强度)。我们分析了这些同时有3.3μm和3.4μmC H特征的天体,确定I3.4/I3.3比值即3.4μm特征的辐射流量与3.3μm特征的辐射流量的比值。最后,通过A3.3/A3.4的比值和I3.4/I3.3的比值得到它们的脂肪分数。
[Abstract]:"Unidentified Infrared Emission" ("Unidentified Infrared Emission") is widely distributed in various celestial environments. They are a very strong group of infrared emission spectra, of which the five bands of 3.3 ~ 6.27.7U ~ (8.6) and 11.3 渭 m are the most significant, and in addition, the bands are 3.4 ~ (6.85) ~ (12.7N) ~ (16.4). At 17.4 渭 m, a weaker emission line of 3.36.2m7.78.6 was also detected. And 11.3 渭 m "uncertified infrared emission characteristics" are usually attributed to polycyclic aromatic hydrocarbon. PAH) molecules. The "unrecognized infrared band" carrier models generally assume that 3.3 渭 m radiation originates from the stretching vibration of aromatic C-H, assuming that 3.4 渭 m radiation originates from the stretching vibration of adipose C-H. We can estimate the fat fraction of UIE carrier from the observed intensities of 3.3 and 3.4 渭 m emission characteristics (for example, carbon atom fraction in fat form) in many celestial bodies. Two spectral signs, 3.3 渭 m and 3.4 渭 m, have been observed at the same time. In this paper, comets, Titan, are selected. Spectrographic analysis of several celestial bodies in Enceladus and Enceladus the fat and aromatic properties of organic matter in these celestial bodies are calculated. Titan spectrum does not have a spectral characteristic of 3.4 渭 m, so it is not taken into account. Two spectra are also selected to represent the interstellar space of the Milky way. The characteristic wavelength of C-H bond stretching based on 3.3 渭 m aromatic hydrocarbon structure is also selected. The characteristic wavelength of C-H bond stretching of fatty hydrocarbon structure is 3.4 渭 m. In this paper, a large number of related organic molecules are analyzed. We get an average of A 3.3 / A 3.4 鈮，

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