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Citation: Tan Xiao-Feng, Dong Feng, Chen Hong, Li Xue-Chu. Formation of CN Radical by DC Discharge of CH₃CN and LIF Measurement[J]. Acta Physico-Chimica Sinica, ;1998, 14(07): 664-668. doi: 10.3866/PKU.WHXB19980718 shu

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

1.
State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023

Received Date: 8 October 1997
Available Online: 15 July 1998

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 od 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.
- CN radical,
- Laser ineuced fluorescence,
- Molecular beam,
- Polarization,
- Cold cathode DC discharge
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Formation of CN Radical by DC Discharge of CH3CN and LIF Measurement

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