气相CBr2的激光诱导荧光光谱

本文报道了在交叉分子束装置中氟原子和二溴甲烷反应生成的CBr2的气相激光诱导荧光光谱的首次实验结果。位于585-664nm范围内的激光诱导荧光光谱由22个峰组成,被指定为CBr2的A(V1'V2'0)←X(000)(V1'=0,1; V2'=0-12)跃迁。从光谱导出v00=14885cm^-^1, 上态振动光谱常数v1'=460, v2'=189cm^-^1, x12'=3.10,x22'=-0.27cm^-^1。本实验结果与CBr2的低温固相光谱进行比较, 发现固相光谱较气相光谱明显蓝移, 确认了CBr2是F+CH2Br2过程的两步反应的产物。

Laser induced fluorescence of CBr2 in the gas phase

The laser induced fluorescence (LIF) of gas-phase CBr2 produced by the reaction of F atom with CH2Br2 in a crossed mol. beam apparatus is reported. The LIF spectrum ranged from 585 to 664 nm and consists of 22 peaks which were assigned to ?v1'v2'0) ?X(000) (v1' = 0, 1; v2' = 0-12) transitions of CBr2. The spectral constants of n00 = 14,885 cm-1 and n1' = 460, n2' = 189 cm-1, x12' = 3.10, x22' = -0.27 cm-1 were derived from the spectra and compared with a solid matrix-isolation study. An obvious shift of 77 cm-1 from the matrix to the gas phase spectrum was found. CBr2 is the product of 2nd step reaction of F atom with CH2Br2.