气相CBr_2的激光诱导荧光光谱  

Laser Induced Fluorescence of CBr_2 in the Gas Phase

作　　者：汪晨熙[1] 詹明生[1] 周士康[1] 宋方青[1] 史济良[2] 李方琳 邱元武[3] 

机构地区：[1]中国科学院安徽光学精密机械研究所激光光谱实验室 [2]中国科学院上海有机化学研究所 [3]同济大学物理系

出　　处：《化学学报》1990年第1期64-68,共5页Acta Chimica Sinica

基　　金：国家自然科学基金

摘　　要：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CBr_2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CBr_2的A(V′_1~V′_20)←X(000)(V′_1=0,1;V′_2=0—12)跃迁。从光谱导出ν_(00)=14885cm^(-1),上态振动光谱常数ν′_1=460,ν′_2=189cm^(-1),x′_(12)=3.10,x′_(22)=-0.27cm^(-1)。本实验结果与CBr_2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CBr_2是:F+CH_2Br_2过程的两步反应的产物。The laser induced fluorescence (LIF) of gas-phase CBr_2 prcduced by the reaction of F atom with CH_2Br_2 in a crossed molecular beam apparatus is reported. The LIF spectrum ranged from 585 to 664nm consists of 22 peaks which were assigned to A(V′_1V′_2O)← X(000) (V′_1=0, 1; V′_2=0—12) transitions of OBr_2. The spectral constants of v_(00)=14885 cm^(-1) and v′_1=460, v′_2=189cm^(-1), x′_(12)=3.10,x′_(22)=-0.27cm^(-1) have been derived from the spectra and compared with that from solid matrix-isolation study. An obvious shift (77 cm^(-1)) of matrix to gas phase spectrum has been found. Determination has been made that OBr_2 is the product of second step reaction of F atom with CH_2Br_2.

关 键 词：二溴卡宾 CBr2 激光诱导 荧光光谱 

分 类 号：O613.71[理学—无机化学]