物理化学学报 >> 2005, Vol. 21 >> Issue (04): 392-396.doi: 10.3866/PKU.WHXB20050410

研究论文 上一篇    下一篇

溴代烷烃与活性氮的反应发光研究

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   

  1. 中国科学院安徽光学精密机械研究所环境光谱学实验室, 合肥 230031; 安徽师范大学物理电信学院原子与分子物理实验室, 芜湖 241000
  • 收稿日期:2004-09-17 修回日期:2004-11-20 发布日期:2005-04-15
  • 通讯作者: 储焰南 E-mail:ychu@aiofm.ac.cn

Chemiluminescence of Alkyl Bromides Reaction with Active Nitrogen

TANG Xiao-Shuan; WANG Hong-Mei; HAN Hai-Yan; LI Jian-Quan; JIN Shun-Ping; HUANG Guo-Dong; CHU Yan-Nan; ZHANG Wei-Jun; ZHOU Shi-Kang   

  1. Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031; Laboratory of Atomic and Molecular Physics, College of Physics and Electronic Information, Anhui Normal University, Wuhu 241000
  • Received:2004-09-17 Revised:2004-11-20 Published:2005-04-15
  • Contact: CHU Yan-Nan E-mail:ychu@aiofm.ac.cn

摘要: 在流动余辉装置上, 利用N2空心阴极放电制备活性氮, 研究了活性氮与溴代烷烃(CHBr3、CH2Br2、C2H5Br、C4H9Br) 反应的化学发光.上述所有反应中, 在550~750 nm波段均观察到了较强的NBr (b1Σ+→X3Σ-)跃迁发射谱. 同时在活性氮与CHBr3和CH2Br2的反应中, 在流动管下游还观察到了CN (A2π, B2πX2Σ+)的发射谱. 验证性的实验表明, 激发态NBr (b1Σ+)是由二步过程形成: N(4S)与溴代烷烃反应生成NBr (X3Σ-), 再通过N2 (A 3Σu+)分子能量转移到激发态NBr (b1Σ+); 而激发态的CN是通过N(4S) + CBr→CN(A, B) + Br过程形成的.

关键词: 活性氮, 能量转移, 发射光谱, NBr, CN

Abstract: Active nitrogen has been prepared by hollow-cathode discharge of N2 in a flowing afterglow system. Strong emission spectra of NBr(b1Σ+X3Σ-) have been observed when alkyl bromides (CHBr3, CH2Br2, C2H5Br, C4H9Br) are added to a stream of active nitrogen. In addition, weak CN(A2π, B2πX2Σ+) emission spectra have been detected only in the case of CHBr3 or CH2Br2 as reagents. Some tentative experiments show that the electronically excited NBr(b1Σ+) is formed by mechanism of metastable N2(A3Σu+) electronic-to-electronic energy transfer from ground state NBr(X3Σ-), which is from the reaction of N(4S) with alkyl bromides. The excited CN (A2π, B2π) comes from the reaction of N(4S) with CBr formed due to CHBr3(or CH2Br2) dissociation by N2(A3Σu+).

Key words: Active nitrogen, Energy transfer, Emission spectra, NBr, CN