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几种C3含氧化合物的真空紫外光电离及燃烧研究

Studies on VUV Photoionization and Combustion of Some C3 Oxygen-Contained Compounds

【作者】 卫立夏

【导师】 盛六四; 齐飞;

【作者基本信息】 中国科学技术大学 , 核技术及应用, 2006, 博士

【摘要】 本论文分两大部分,第一部分介绍C3含氧化合物(丙酮、2-丙醇和1-丙醇)的真空紫外同步辐射光电离研究,并结合量子化学的从头计算分析了实验结果。第二部分介绍C3含氧化合物的燃烧研究,利用同步辐射光电离技术,结合分子束质谱技术探测C3含氧化合物的燃烧中间产物,并得到了这些中间产物的摩尔分数。 第一部分 C3含氧化合物的真空紫外光电离研究 (1) 介绍了真空紫外同步辐射光电离质谱研究的方法,以及各种基本的光解离反应的机理。扼要描述了本论文所用的国家同步辐射实验室的真空紫外光束线和燃烧实验站的基本构造。 (2) 利用同步辐射真空紫外光电离结合飞行时间质谱研究了丙酮(AC)的光电离和光解离,得到了该分子的电离能以及碎片离子CH3COCH3+、CH3+、C2H3+、C3H3+、C3H5+、CH2CO+、CH3CO+、C3H4O+和CH3COCH2+等的出现势。其中,C3H3+、C3H5+和CH3COCH+2+等的出现势是第一次探测到。利用Oaussian-3(G3)程序进行量化计算,得到分子的电离能为9.74 eV。计算的电离能与实验值(9.69±0.02 eV)很接近。 结合实验结果和理论计算,分析了CH3CO+、CH2CHO+、CH2CO+、CH2CO+、CH3+、CH3COCH2+、C3H3+、C3H6O+和C3H6O+等主要离子可能的解离通道,并得到了相应通道的解离能。 (3) 利用同步辐射真空紫外光电离结合飞行时间质谱研究了2-丙醇(IPA)的光电离和光解离,得到了该分子的电离能以及碎片离子CH3CH=CH2+、CH3CHCH3+、CH2=CHOH+、CH3CHOH+和CH3C(OH)CH3+等的出现势。其中,CH3CH=CH2+的出现势与文献上的估计值差异较大,对这一离子进行了详细的分析。利用Gaussian-3(G3)程序进行量化计算,得到分子的电离能为10.09 eV。计算的电离能与实验值(10.05±0.02 eV)很接近。

【Abstract】 This dissertation includes two parts. The first part describes the VUV photoionization and dissociative photoionization of C3 oxygen-contained compounds, i.e. acetone (AC), 2-propanol (isopropanol, IPA) and 1-propanol (n-propanol, NPA) using synchrotron radiation. The dissociation channels of these three compounds are established with the help of ab initio calculation. The second one deals with the identification and the determination of mole fractions of combustion intermediates of six C3 oxygenated hydrocarbons/oxygen flames, using synchrotron radiation photoionization combined with molecular beam mass spectrometry.Part I VUV photoionization and dissociative photoionization studies of C3 oxygenated compounds(1) The method of photoionization mass spectrometry using synchrotron radiation is introduced, together with the fundamental photoionization mechanism. The VUV beamline and combustion endstation at the National Synchrotron Radiation Laboratory in Hefei are described briefly. It is the first time to study the ionization of such species by using synchrotron radiation, combined with reflectron time-of-flight mass spectrometry (RTOF-MS).(2) The photoionization and dissociative photoionization of acetone have been studied at the photon energy range of 8 - 20 eV. The ionization energy (IE) of the molecule, CH3COCH3, and the appearance energies (AEs) of the fragment ions, CH3+, C2H3+, C3H3+, C3H5+, CH2CO+, CH3CO+, C3H4O+ and CH3COCH2+ have been measured. Besides the common fragment CH3CO+, some new fragments are also observed, including C3H3+, C3H5+ and CH3COCH2+. With the help of G3 results, the dissociation channels for the formation of the fragment ions CH3CO+, CH2CO+, CH3+,

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