常温大气压下,在电子能量为0.35～0.65 eV的范围内,使用 氮气负电晕放电-电子吸附-离子迁移谱, 测量了CH2 Br2 , CH2 BrCl,CHBr3 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(CH2 Br2 )>k(CH2 BrCl), k(CH2 Br2 )>k(CHBr3 ),并根据电子亲和势对CH2 Br2 和CH2 BrCl的 大小关系进行理论分析。首次对CHBr3 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CHBr3 分子络合成团簇离子Br-(H2 O)n (CHBr3 )m 。

Using atmospheric pressure nitrogen negative corona discharge electron attachment ion mobility spectrometry, the rate constants of electron attachment to CH2 Br2 , CH2 BrCl and CHBr3 were measured at ambient temperature as a function of average electron energy in the range from 0.35 eV to 0.65 eV. The rate constants for electron attachment to CH2 Br2 , CH2 BrCl, CHBr3 follow the relations of k(CH2 Br2 )>k(CH2 BrCl), k(CH2 Br2 )>k(CHBr3 ), and the relations between CH2 Br2 and CH2 BrCl are discussed in theory according to the electron affinity. In addition, the process of electron attachment to CHBr3 is firstly qualitative analyzed. It’s found that when the sample vapor is introduced into the drift region, the bromine ion will cluster with the molecule of CHBr3 to be Br-(H2 O)n (CHBr3 )m.