物理化学学报 >> 1998, Vol. 14 >> Issue (07): 664-668.doi: 10.3866/PKU.WHXB19980718

研究简报 上一篇    下一篇

直流放电制备CN自由基及其LIF探测

谭晓峰, 董峰, 陈宏, 李学初   

  1. 中国科学院大连化学物理研究所分子反应动力学国家重点实验室，大连 116023
  • 收稿日期:1997-10-08 修回日期:1998-01-24 发布日期:1998-07-15
  • 通讯作者: 李学初

Formation of CN Radical by DC Discharge of CH3CN and LIF Measurement

Tan Xiao-Feng, Dong Feng, Chen Hong, Li Xue-Chu   

  1. State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023
  • Received:1997-10-08 Revised:1998-01-24 Published:1998-07-15
  • Contact: Li Xue-Chu

PDF

2576

赞

关键词: CN自由基, 激光诱导荧光, 分子束, 偏振, 直流冷阴极放电

Abstract:

Jet cooled CN radical beam was formed by cold cathode DC discharge of CH3CNunder molecular beam conditions. The cylindrical cold cathode was placed between the skimmer and the nozzle to prevent the nozzle from being clogged by carbon particles. The pulsed photon counting LIF measurement was seriously jeopardized by the high intensive scattering laser light due to CN(B2Σ)'s short lifetime (70ns) and weak fluorescence. By using an attenuator to reduce laser intensity or a polaroid to reduce the scattering laser intensity, we obtained LIF spectra with good S/N ratio. With the theoretical simulaed spectra, the effects of laser p0larization on LIF were discussed and the relative populations of CN rotational and vibrational states were obtained.

Key words: CN radical, Laser ineuced fluorescence, Molecular beam, Polarization, Cold cathode DC discharge