利用双层流动反应管作为束源 ,研究了F与CH2 Br2 反应生成的CBr2 和Br2 的气相激光诱导荧光色散谱 ,将得到的谱线分别指定为CBr2 的 A(0 ,13,0 )→ X(0 ,v2 ″,0 ) (v2 ″ =1～ 6 )跃迁和Br2 的 B3 Π+ u → X1Σ+ g 跃迁 ,从光谱中首次得到气相CBr2 自由基基态弯曲振动频率ν2 ″ =2 15cm-1,实验确认了CBr2 自由基和Br2 是F +CH2 Br2 过程多步反应的产物 The gas-phase laser-induced fluorescence dispersion spectra of CBr2 and Br2 produced by the reaction of F with CH2 Br2 were studied using a double-flow reaction tube as the beam source. The resulting spectra were designated as A (0, 13, 0) → X (V2 “= 1 ~ 6) and B3 Π + u → X1Σ + g transition of Br2 were obtained from the spectra for the first time. The frequency of bending vibration of ground-state CBr2 radical ν2” = 2 15cm-1 , The experiment confirmed that CBr2 free radical and Br2 is the product of multi-step reaction of F + CH2 Br2