| 乙苯光电离的实验研究 |
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| 引用本文： | 陶玲,黄明强,郝立庆,张为俊,王振亚,孔蕊弘,单晓斌,刘付轶,盛六四.乙苯光电离的实验研究[J].高等学校化学学报,2010,31(10):2063-2066. |
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| 作者姓名： | 陶玲 黄明强 郝立庆 张为俊 王振亚 孔蕊弘 单晓斌 刘付轶 盛六四 |
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| 作者单位： | 1. 中国科学院安徽光学精密机械研究所环境光谱学实验室,
2. 大气成分与光学中国科学院重点实验室, 合肥 230031;
3. 厦门大学嘉庚学院环境科学与工程系, 漳州 363100;
4. 中国科学技术大学国家同步辐射实验室, 合肥 230026 |
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| 基金项目： | 国家自然科学基金(批准号:10979061,40975080); 中国科学院创新基金(批准号:KJCX2-YW-N24); 国家同步辐射实验室“教育部创新计划”同步辐射研究生创新基金(批准号:20090162S)资助 |
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| 摘 要： | 利用真空紫外同步辐射和反射式飞行时间质谱研究了乙苯分子的光电离, 通过测量母体分子的光电离质谱(PIMS)以及母体离子和主要碎片离子的光电离效率曲线(PIEs), 确定了乙苯分子的电离能IE(C8H+10)=(8.66±0.02) eV, 主要碎片离子C7H+7和C6H+6的出现能分别为(10.81±0.02)和(10.99±0.02) eV; 利用经验公式计算出产生碎片离子C7H+7和C6H+6需要的解离能(Ed)分别为(2.15±0.04)和(2.33±0.04) eV. 结合相关的热化学参数, 推算出C8H+10, C7H+7和C6H+6的标准生成焓分别为865.5, 927.2和1037.9 kJ/mol. 为进一步研究乙苯的大气光氧化反应机理提供了参考.
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| 关 键 词： | 乙苯 同步辐射 光电离 碎片离子 |
| 收稿时间： | 2009-11-27 |
Experimental Studies on Photoionization of Ethylbenzene |
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| TAO Ling,HUANG Ming-Qiang,HAO Li-Qing,ZHANG Wei-Jun,WANG Zheng-Ya,KONG Rui-Hong,SHAN Xiao-Bin,LIU Fu-Yi,SHENG Liu-Si.Experimental Studies on Photoionization of Ethylbenzene[J].Chemical Research In Chinese Universities,2010,31(10):2063-2066. |
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| Authors: | TAO Ling HUANG Ming-Qiang HAO Li-Qing ZHANG Wei-Jun WANG Zheng-Ya KONG Rui-Hong SHAN Xiao-Bin LIU Fu-Yi SHENG Liu-Si |
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| Institution: | 1. Laboratory of Environment Spectroscopy, ;
2. Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
3. Xiamen University Tan Kah Kee College, Zhangzhou 363100, China;
4. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China) |
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| Abstract: | The photoionization of ethylbenzene(C8H10) was investigated using the supersonic molecular beam, the reflectron-time-of-flight mass spectrometer(RTOF-MS) and vacuum ultraviolet(VUV) synchrotron radiation. The photoionization mass spectrum(PIMS) and the photoionzation efficiency(PIE) curves of the parent ion and some fragment ions were obtained. The ionization energy(IE) of C8H10 and the appearance energies(AEs) of C7H+7 and C6H+6 were measured to be (8.66±0.02), (10.81±0.02) and (10.99±0.02) eV, respectively. The dissociation energies(Eds) to produce C7H+7 and C6H+6 were deduced to be (2.15±0.04) and (2.33±0.04) eV. The formation enthalpies of C8H+10, C7H+7 and C6H+6 were also deduced to be 865.5, 927.2 and 1037.9 kJ/mol. All the parameters are very important for investigating the oxidation mechanism of ethylbenzene in the atmosphere. |
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| Keywords: | Ethylbenzene Synchrotron radiation Photoionization Fragment ion |
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