直流放电制备CN自由基及其LIF探测  

Formation of CN Radical by DC Discharge of CH_3CN and LIF Measurement

作　　者：谭晓峰[1] 董峰[1] 陈宏[1] 李学初[1] 

机构地区：[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

出　　处：《物理化学学报》1998年第7期664-668,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：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 skimmerand the nozzle to prevent the nozzle from being clogged by carbon particles. The pulsed photoncounting LIF measurement was seriously jeopardized by the high intensive scattering laser lightdue to CN(B2Z)’s short lifetime (70ns) and weak fiuorescence. By using an attenuator to reducelaser intensity or a polaroid to reduce the scattering laser intensity, we obtained LIF spectra withgood S/N ratio. With the theoretical simulasd spectra, the effects of laser p0larization on LIFwere discussed and the relative populations of CN rotational and vibrational states were obtained.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 skimmerand the nozzle to prevent the nozzle from being clogged by carbon particles. The pulsed photoncounting LIF measurement was seriously jeopardized by the high intensive scattering laser lightdue to CN(B2Z)'s short lifetime (70ns) and weak fiuorescence. By using an attenuator to reducelaser intensity or a polaroid to reduce the scattering laser intensity, we obtained LIF spectra withgood S/N ratio. With the theoretical simulasd spectra, the effects of laser p0larization on LIFwere discussed and the relative populations of CN rotational and vibrational states were obtained.

关 键 词：氰基自由基 直流放电 探测 LIF 制备 

分 类 号：O621.146[理学—有机化学]