高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (5): 906.

• 研究论文 • 上一篇    下一篇

CCl2(A1B1)被O2及取代甲烷类分子猝灭的动力学研究

高义德, 胡长进, 陈旸, 戴静华, 陈从香   

  1. 中国科学院选键化学开放实验室, 中国科学技术大学化学物理系, 合肥 230026
  • 收稿日期:2000-12-12 出版日期:2002-05-24 发布日期:2002-05-24
  • 通讯作者: 陈从香(1941年出生),男,教授,博士生导师,主要从事激光光谱和分子反应动力学研究.E-mail:cxchcn@ustc.edu.cn E-mail:cxchcn@ustc.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:10032050);中国科学院重大项目(批准号:HH030301);国家重点基础研究专项基金(批准号:G1999075304)资助.

Kinetics Studies on Quenching of CCl2CA1B1 and a3B1 by O2, CF4 CF2Cl2,CH3NO2,CH2Br2 and Chloromethane

GAO Yi-De, HU Chang-Jin, CHEN Yang, DAI Jing-Hua, CHEN Cong-Xiang   

  1. Open Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2000-12-12 Online:2002-05-24 Published:2002-05-24

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摘要： 对CCl4/Ar混合气体放电产生CCl2自由基,再用541.52nm激光将电子基态CCl2激发到激发态A1B1(0,4,0)振动态的k=0能级上,通过检测激发态CCl2时间分辨荧光信号,测得室温下CCl2(A1B1)被O2,CF4,CF2Cl2,CH3NO2,CH2Br2等分子猝灭的实验结果.用改进的三能级模型分析处理实验数据,获得态分辨速率常数KA和Ka值,并对实验结果进行了讨论.

关键词: CCl2(A1B1, a3B1), 动力学, 猝灭速率常数, 取代甲烷分子

Abstract: CCl2 free radicals were produced by dc discharge of CCl4(in Ar).Ground electronic state CCl2 radical was electronically excited to A1B1(0,4.0) state k=0 level with Nd YAGlaser pumped dye laser at 541.52 nm.Experimental quenching data of CCl2(A1B1 and a3B1) by O2, CF4, CF2Cl2, CH3NO2, CH2Br2 and chloromethane were obtained by observing time resolved fluorescence from the excited CCl2 radicals transition, which showed a superposition of two exponential decay components.The state-resolved rate constants KA and Ka were acquired by analyzing and dealing with these data by using a three-level-model.

Key words: CCl2(A1B1, a3B1), Kinetics, Quenching rate constant, Substituted methane

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