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

• Basic Optics • Previous Articles     Next Articles

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

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

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