物理化学学报 >> 1999, Vol. 15 >> Issue (02): 156-160.doi: 10.3866/PKU.WHXB19990212

研究论文 上一篇    下一篇

环氧乙烷的真空紫外同步辐射光电离与光解离

刘付轶, 盛六四, 齐飞, 高辉, 张允武   

  1. 中国科技大学国家同步辐射实验室，合肥 230026
  • 收稿日期:1998-04-06 修回日期:1998-07-27 发布日期:1999-02-15
  • 通讯作者: 张允武

VUV Photoionization and Photodissociation of Ethylene oxide by Synchrotron Radiation

Liu Fu-Yi, Sheng Liu-Si, Qi Fei, Gao Hui, Zhang Yun-Wu   

  1. National Synchrotron Radiation Laboratory,University of Science Technology of China,Hefei 230026|Department of Chemistry,University of Science Technology of China,Hefei 230026
  • Received:1998-04-06 Revised:1998-07-27 Published:1999-02-15
  • Contact: Zhang Yun-Wu

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摘要：

利用真空紫外同步辐射和自制的飞行时间质谱（TOF－MS）仪，研究了环氧乙烷的光电离与光解离过程, 通过测量各离子的光电高效率（PIE）曲线，获得了该分子的电离势和所有碎片离子的出现势．分析了离子的光电离解离通道，并讨论了它们的竞争情况．结合有关公认的热力学数据，算出它们的标准生成焓.

关键词: 环氧乙烷, 真空紫外, 光电离, 生成焓

Abstract:

 Photoionization and photodissociation of ethylene oxide are performed by using a time-of-flight mass spectrometer(TOF-MS) with vacuum ultraviolet(VUV) photons from Hefei synchrotron radiation source. The photoionization mass spectrum and the photoionization ef ficiency(PIE) curves of the fragment ions are measured. The appearance potentials of all the observed ions are obtained from then PIE curves. From these data, the formation enthalpies of some chief ions have been evaluated Possible channels and their competition of dissociative photoionization of ethylene oxide have been discussed.

Key words: Ethylene oxide, Vacuum ultraviolet(VUV), Photoionization, Formation enthalpy