本文關(guān)鍵詞：太陽系天體有機物質(zhì)的芳香性與脂肪性　出處：《南昌大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 芳香族碳氫化合物 脂肪族碳氫化合物 紅外光譜

【摘要】：“未證認的紅外譜帶”(“Unidentified Infrared Emission”,UIE)廣泛分布于多種天體環(huán)境,它們是一組很強的紅外發(fā)射譜,以3.3、6.2、7.7、8.6和11.3μm五條譜帶最為顯著,除此之外在3.4、6.85、12.7、16.4、17.4μm處還探測到較弱的發(fā)射線。3.3,6.2,7.7,8.6,和11.3μm“未認證紅外發(fā)射特征”通常歸因于多環(huán)芳香烴(polycyclic aromatic hydrocarbon,PAH)分子。“未證認的紅外譜帶”載體模型大都認為3.3μm輻射源于芳香C-H的伸縮振動,若假定3.4μm輻射全部源于脂肪C-H的伸縮振動;我們就可以從3.3和3.4μm發(fā)射特征在天體中所觀察到的強度估算出UIE載體成分中的脂肪份數(shù)(例如脂肪形式中的碳原子份數(shù))。在很多天體中,人們確實同時觀測到了3.3μm和3.4μm這兩個譜征。本文主要選取了彗星、土衛(wèi)六、土衛(wèi)七和土衛(wèi)八幾個天體的光譜圖分析計算這幾個天體中有機物質(zhì)的脂肪性和芳香性,其中土衛(wèi)六光譜中沒有3.4μm的光譜特征所以不考慮。另外,也選取了兩個光譜圖代表銀河系星際空間�；�3.3μm為芳香烴結(jié)構(gòu)的C H鍵拉伸的特征波長,而脂肪烴結(jié)構(gòu)的C H鍵拉伸的特征波長為3.4μm,本文通過分析大量相關(guān)有機分子,我們得到一個平均值A(chǔ)3.3/A3.4≈0.94(A3.4是3.4μm脂肪族的帶強度,A3.3是3.3μm芳香族的帶強度)。我們分析了這些同時有3.3μm和3.4μmC H特征的天體,確定I3.4/I3.3比值即3.4μm特征的輻射流量與3.3μm特征的輻射流量的比值。最后,通過A3.3/A3.4的比值和I3.4/I3.3的比值得到它們的脂肪分數(shù)。
[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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