物理化学学报 >> 2001, Vol. 17 >> Issue (06): 516-520.doi: 10.3866/PKU.WHXB20010609

研究论文 上一篇    下一篇

CCl2(A 1B 1,a3B1)自由基被烷烃类分子猝灭动力学

高义德;胡长进;金瑾;陈旸;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:2000-11-06 修回日期:2001-02-11 发布日期:2001-06-15
  • 通讯作者: 陈从香 E-mail:cxchen@ustc.edu.cn

Kinetic Studies on Quenching of CCl2(A 1B 1,a3B1) by Alkanes

Gao Yi-De;Hu Chang-Jin;Jin Jin;Chen Yang;Chen Cong-Xiang   

  1. Open Laboratory of Bond Selective Chemistry,Department of Chemical physics,Univ ersity of Science and Technology of China ,Hefei ,Anhui 230026
  • Received:2000-11-06 Revised:2001-02-11 Published:2001-06-15
  • Contact: Chen Cong-Xiang E-mail:cxchen@ustc.edu.cn

摘要: 用放电LIF实验装置,对CCl4/Ar混合气体放电产生CCl2自由基,再用541.52 nm激光将电子基态CCl2激励到激发态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)被烷烃类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 1B 1,a3B1), 烷烃分子, 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 alkanes 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 first time acquired by analyzing and treating these data by using threelevelmodel,which was put forward by us.kA and ka increase on the whole with increasing the number of C-H bonds in alkanes.

Key words: CCl2(A 1B 1,a3B1), Alkanes,  Kinetics, Quenching rate constant, Three-level-model