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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (7): 599-604. 上一篇    下一篇

研究论文

用共振增强多光子电离方法研究几种含溴化合物的光解

张秀*,1，张冰2   

  1. (1孝感学院物理系 孝感 432000)
    (2中国科学院武汉物理与数学研究所 武汉 430071)
  • 投稿日期:2005-04-25 修回日期:2005-12-09 发布日期:2006-04-15
  • 通讯作者: 张秀

Investigations of Photodissociation of Some Bromides Using Resonance-enhanced Multiphoton Ionization

ZHANG Xiu*,1, ZHANG Bing2   

  1. (1 Department of Physics, Xiaogan University, Xiaogan 432000)
    (2 Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071)
  • Received:2005-04-25 Revised:2005-12-09 Published:2006-04-15
  • Contact: ZHANG Xiu

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利用飞行时间质谱仪(TOF)和共振增强多光子电离(REMPI)方法, 研究了两种正一溴代烷烃(C2H5Br, n-C3H7Br)和溴苯(C6H5Br)在234及267 nm附近的光解. 测出了这几种含溴化合物在不同波长下光解产物Br*和Br的分支比N(Br*)/N(Br), 并根据从头计算结果, 解释了这几种含溴化合物光解产物的分支比随光解波长变化的趋势及几个低激发态势能面之间的关系.

关键词: 共振增强多光子电离, 光解, 分支比, 含溴化合物

Using time-of-flight mass spectroscopy and resonance-enhanced multiphoton ionization (REMPI) scheme, the photodissociation of two alkyl bromides (C2H5Br, n-C3H7Br) and bromobenzene (C6H5Br) near 234 and 267 nm was investigated. The branching ratios N(Br*)/N(Br) of the compounds at two wavelengths were measured, and the relationships between the branching ratio and the photolysis wavelengths and among the potential energy surfaces of the low excited states were explained based on our ab initio calculations.

Key words: resonance-enhanced multiphoton ionization, photodissociation, branching ratio, bromide