高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (10): 2063.

• 研究论文 • 上一篇    下一篇

乙苯光电离的实验研究

陶玲1,2, 黄明强3, 郝立庆1,2, 张为俊1,2, 王振亚1,2, 孔蕊弘4, 单晓斌4, 刘付轶4, 盛六四4   

  1. 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
  • 收稿日期:2009-11-27 出版日期:2010-10-10 发布日期:2010-10-10
  • 通讯作者: 张为俊, 男, 博士, 研究员, 博士生导师, 主要从事环境光谱学研究. E-mail: wjzhang@aiofm.ac.cn
  • 基金资助:

    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)和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.

Experimental Studies on Photoionization of Ethylbenzene

TAO Ling1,2, HUANG Ming-Qiang3, HAO Li-Qing1,2, ZHANG Wei-Jun1,2*, WANG Zheng-Ya1,2, KONG Rui-Hong4, SHAN Xiao-Bin4, LIU Fu-Yi4, SHENG Liu-Si4   

  1. 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)
  • Received:2009-11-27 Online:2010-10-10 Published:2010-10-10
  • Contact: ZHANG Wei-Jun. E-mail: wjzhang@aiofm.ac.cn
  • Supported by:

    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)和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.

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.

关键词: 乙苯, 同步辐射, 光电离, 碎片离子

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.

Key words: Ethylbenzene, Synchrotron radiation, Photoionization, Fragment ion

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