物理化学学报 >> 2001, Vol. 17 >> Issue (10): 944-947.doi: 10.3866/PKU.WHXB20011016

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CCl2自由基被无机小分子猝灭的速率常数

高义德;刘云珍;冉琴;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:2001-03-20 修回日期:2001-06-06 发布日期:2001-10-15
  • 通讯作者: 陈从香 E-mail:cxchen@ustc.edu.cn

Measurements of Quenching Rate Constants of CCl2(A 1B1 and a 3B 1) by Some Inorganic Molecules

Gao Yi-De;Liu Yun-Zhen;Ran Qin;Chen Cong-Xiang   

  1. Open Laboratory of Bond Selective Chemistry,Department of Chemical physics,University of Science and Technology of China ,Hefei 230026
  • Received:2001-03-20 Revised:2001-06-06 Published:2001-10-15
  • Contact: Chen Cong-Xiang E-mail:cxchen@ustc.edu.cn

摘要: 对CCl4/Ar混合气体脉冲直流高压放电产生CCl2自由基,用541.52 nm激光将电子基态CCl2激励到A 1B1(0,4,0)振动能级上. 通过检测激发态CCl2时间分辨荧光信号,测得室温下CCl2(A 1B1和a 3B1)被O2、N2、NO、 CO2、 CS2、H2O、SO2,和SF6分子猝灭的实验结果.用我们提出的三能级模型分析处理实验数据,获得了CCl2(A 1B1)态和CCl2(a 3B1)态的碰撞猝灭速率常数kA和ka值.

关键词: CCl2(A 1B1,a 3B1), 动力学, 猝灭速率常数, 三能级模型

Abstract: CCl2 free radicals were produced by dc discharge of CCl4(in Ar). Ground electronic state CCl2 radical was electronically excited to A 1B1 (0,4,0) state with Nd:YAG laser pumped dye laser at 541.52 nm. Experimental quenching data of CCl2 (A 1B1 and a 3B1) by O2,N2,NO,CO2,CS2,H2O,SO2 and SF6 were obtained by observing time resolved fluorescence from the excited CCl2 radicals,which showed a superposition of two exponential decay components. The stateresolved rate constants kA and ka were first time acquired by analyzing and dealing with these data by using a threelevelmodel proposed by us.

Key words: CCl2(A 1B1a 3B 1), Kinetics, Quenching rate constant, Three-level model