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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CH_2Br_2,CH_2BrCl,CHBr_3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(CH_2Br_2)>k(CH_2BrCl),k(CH_2Br_2)>k(CHBr_3),并根据电子亲和势对CH_2Br_2和CH_2BrCl的大小关系进行理论分析。首次对CHBr_3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CHBr_3分子络合成团簇离子Br~-(H_2O)_n(CHBr_3)_m。
The electron adsorption rate constant of CH_2Br_2, CH_2BrCl and CHBr_3 was measured at room temperature and atmospheric pressure in the range of 0.35 ~ 0.65 eV using nitrogen negative corona discharge-electron adsorption-ion mobility spectrometry K (CH 2 Br 2)> k (CH 2 Br 2)> k (CHBr 3), and the relationship between CH 2 Br 2 and CH 2 Br Cl was theoretically analyzed based on the electron affinities. For the first time, the electronic adsorption process of CHBr_3 was qualitatively analyzed. It was found that the bromide ions and CHBr_3 complexed with cluster ions Br_ (H_2O) _n (CHBr_3) _m when the sample steam was introduced into the transfer tube in the migration zone.