J4 ›› 2016, Vol. 33 ›› Issue (1): 88-92.

• 激光应用 • 上一篇    下一篇

大气压电晕放电离子迁移谱测量溴代烷烃的电子吸附速率常数

许贝贝 牛文琪 高慧 洪炎 沈成银 王鸿梅 黄超群 江海河 储焰南   

  1. 1 中国科学院合肥物质科学研究院医学物理中心医用光谱质谱研究室, 安徽 合肥 230031;2 中国科学院安徽光学精密机械研究所环境光谱学研究室, 安徽 合肥 230031;3 安徽农业大学, 安徽 合肥 230036
  • 收稿日期:2015-03-16 修回日期:2015-04-15 出版日期:2016-01-28 发布日期:2016-01-06

Rate constants of electron attachment to brominated methanes measured by corona discharge electron attachment ion mobility spectrometry

Xu Bei-bei, Niu Wen-qi, Gao Hui, Hong Yan, Shen cheng-yin, Wang Hong-mei, Huang Chao-quan, Jiang Hai-he, Chu Yan-nan   

  1. 1. Laboratory Medical Optical and Mass Spectrometry, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, No. 350, Scienti?c Road, Hefei 230031, China; 2. Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, No. 350, Scienti?c Road, Hefei 230031, China; 3. School of Science, Anhui Agricultural University, Hefei 230036, China
  • Received:2015-03-16 Revised:2015-04-15 Published:2016-01-28 Online:2016-01-06

摘要:

在常温大气压下,使用氮气负电晕放电-电子吸附-离子迁移谱,在电子能量为0.35eV到0.65eV的范围内,测量了二溴甲烷,溴氯甲烷,三溴甲烷的电子吸附速率常数,得到电子吸附速率常数的大小关系为k(二溴甲烷)>k(溴氯甲烷),k(二溴甲烷)>k(三溴甲烷),并根据电子亲和势对二溴甲烷和溴氯甲烷的大小关系进行理论分析。另外,我们也首次对三溴甲烷的电子吸附过程进行了定性分析,发现样品蒸汽在迁移区通入迁移管时,溴离子会与三溴甲烷分子络合成团簇离子Br-(H2O)n(CHBr3)m。

关键词: 光谱学;离子迁移谱;电晕放电;速率常数

Abstract:

Using atmospheric pressure nitrogen negative corona discharge electron attachment ion mobility spectrometry, the rate constants of electron attachment to CH2Br2, CH2BrCl and CHBr3 have been measured at ambient temperature as a function of average electron energy in the range from 0.35 to 0.65eV. The rate constants for electron attachment to CH2Br2, CH2BrCl, CHBr3 follow the relations of k(CH2Br2)>k(CH2BrCl), k(CH2Br2)>k(CHBr3), and the relations between CH2Br2 and CH2BrCl are discussed in theory according to the electron affinity. In addition, the process of electron attachment to CHBr3 was firstly qualitative analysised. when the sample vapor was introduced the drift region, the bromine ion clustered with the molecule of CHBr3 to be Br-(H2O)n(CHBr3)m.

Key words: spectroscopy; ion mobility spectrometry; corona discharge; rate constant

中图分类号: