F和N原子与卤代甲烷反应生成CN的化学发光与动力学  

Chemiluminescence and Dynamics of CN Produced by the Reactions of F and N Atoms with Halomethanes

作　　者：周金刚[1] 詹明生[1] 周士康[1] 黄青[1] 王谨[1] 胡正发[1] 史济良[2] 

机构地区：[1]中国科学院安光所激光光谱开放实验室,合肥230031 [2]中国科学院上海有机所,上海200032

出　　处：《Chinese Journal of Chemical Physics》1996年第3期199-204,共6页化学物理学报（英文）

基　　金：国家自然科学基金资助课题

摘　　要：在交叉分子束装置上,进行了F和N原子同时与卤代甲烷CH_mX_(4-m)(X=Cl,Br,m≤4)反应的化学发光实验研究,得到可见及紫外波段内较强的CN(A^2Ⅱ→X^2∑^-)和CN(B^2∑^-→X^2∑^-)发射光谱,其中CN(A^2Ⅱ)态具有较高的振动激发.分析反应机理后认为:F原子的存在对CN(A^2Ⅱ,B^2∑^-)的形成起着重要的作用,高振动激发态CN(A^2Ⅱ)产生于基态N原子与CF的原子重排反应,CN(B^2∑^-)则由CX(A^2Ⅱ)与背景分子的碰撞传能产生.The chemiluminescence produced by the reactions of F and N atoms with halomethanes CHmX4-m(X = Cl ,Br,m≤4) was obtained in the visible region in crossed molecular beam apparatus operated in multi-collision condition. The spectra were assigned to CN (B2∑+ →X2∑-) and CN (A2∏→X2∑-) transitions. The (A2∏) was found to lie in highly excited vibrational states with a broad population distribution. A dynamics analysis proposed that the addition of F Atoms plays an important role in the formation of CN(A2∏,B2∑-) and that CN(A2∏) is formed from an atom recombination process . CN (B2∑+ ) is populated by energy transfer collision of CN(A2∏) with background molecules.

关 键 词：氟原子 氮原子 CN自由基 卤代甲烷 化学发光 

分 类 号：O623.76[理学—有机化学] O643.1[理学—化学]