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Electronically Excited NX(b)(X=F,Cl,Br) Formation by Active Nitrogen Reaction
Tang Xiaoshuan,Wang Hongmei,Han Haiyan,Li Jianquan,Jin Shunping,Huang Guodong,Chu Yannan*,Zhang Weijun,Zhou Shikang
Author NameAffiliationE-mail
Tang Xiaoshuan Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031; Laboratory of Atomic and Molecular Physics, College of Physics and Elect  
Wang Hongmei Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031  
Han Haiyan Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031  
Li Jianquan Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031  
Jin Shunping Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031  
Huang Guodong Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031  
Chu Yannan* Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031 ychu@aiofm.ac.cn  
Zhang Weijun Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031  
Zhou Shikang Laboratory of Environental Spectroscopy, Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031  
Abstract:
A new method for producing electronically excited nitrogen monohalides NX(b) (X=F,Cl,Br) is reported. The strong emission spectra of NBr(b1Σ+→X3Σ–) are observed when alkyl bromides (CHBr3, CH2Br2, C2H5Br, and C4H9Br) are added to a stream of active nitrogen, generated by a hollow-cathode discharge of N2, in a flowing afterglow system. Some tentative experiments show that the electronically excited NBr(b) is formed by means of metastable N2(A3Σu+) Electronic-to-Electronic energy transfer to NBr(X), which is from the reaction of N(4S) with alkyl bromides. The emission spectra of NCl(b1Σ+→X3Σ–) are obtained when CCl4 or SOCl2 is admitted into a flow of active nitrogen, but neither CHCl3 nor CH2Cl2 addition results in such an emission. It has been proposed that the origin of the excited NCl(b) is an energy transfer from N2 (A) to NCl(X), generated by the reaction of N(4S) with CCl3 (or SOCl2). Similar experiments are also carried out with SF6 as reagent of active nitrogen, or as mixture with N2 in the discharge. By recording fluorescence it was found that excited NF(b) is produced only under discharge through N2/SF6 mixture. The NF(b) state presumably arises from the energy transfer from N2(A) to NF(X), and the latter is generated from the abstraction of fluorine by N(4S) from SF5.
Key words:  Active nitrogen, NX (X=F,Cl,Br), Energy transfer, Emission spectra
FundProject:
活性氮反应产生激发态卤化氮实验研究
唐晓闩,王鸿梅,韩海燕,李建权,金顺平,黄国栋,储焰南*,张为俊,周士康
摘要:
报道了利用氮气放电产生的活性氮有效制备激发态卤氮自由基NX(b) (X=F, Cl, Br)的方法.在流动余辉装置上,将含溴有机物CH2Br2、 CHBr3、 C2H5Br、 C4H9Br加入到活性氮中,在550~750 nm观察到了较强的NBr(b→X)跃迁发射光谱.机理分析表明,活性氮中的基态氮原子N(4S)与含溴分子反应首先产生基态的NBr,由于亚稳态分子N2(A3Σ+u)的能量转移作用,基态NBr被激发到NBr(b).当含氯有机物CCl4、SOCl2加入到活性氮中时,观察到了NCl(b→X)的发射
关键词:  活性氮  卤化氮  发射光谱  能量转移
DOI:10.1088/1674-0068/18/6/887-891
分类号: