高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (6): 1006.

• 研究论文 • 上一篇    下一篇

CCl2(A1B1)被甲烷及氯代甲烷猝灭动力学

高义德, 陈旸, 裴林森, 马华强, 马兴孝, 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:2000-05-16 出版日期:2001-06-24 发布日期:2001-06-24
  • 通讯作者: 陈从香(1941年出生),男,教授,博士生导师,从事激光光谱和分子反应动力学研究.E-mail:cxchen@ustc.edu.cn E-mail:cxchen@ustc.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:299730380和10032050);中国科学院重大项目基金(批准号:HH030301)资助

Kinetic Studies on State-state Transitions for ·CCl2(X1A1,A1B1,a3B1) Radical and Quenching of ·CCl2(A1B1 and a3B1) with Methane and Chloromethane

GAO Yi-De, CHEN Yang, PEI Lin-Sen, MA Hua-Qiang, MA Xing-Xiao, CHEN Cong-Xiang   

  1. Institute of Polymer Science & Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2000-05-16 Online:2001-06-24 Published:2001-06-24

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摘要： 用放电-LIF实验装置,对CCl4/Ar混合气体放电产生·CCl2,再用541.52nm激光将电子基态·CCl2激发到激发态A1B1(0,4,0)模pR1能级上,检测激发态·CCl2时间分辨荧光信号,测得室温下·CCl2(A1B1)被甲烷及氯代甲烷分子猝灭的实验结果,用三能级模型分析处理实验数据获得态分辨速率常数kq1,kq2和kq3值和·CCl2(A1B1→X1A1)及(a3B1→X1A1)自发辐射寿命分别为(0.83±0.03)μs和(3.12±0.25)μs.

关键词: CCl2(A1B1, a3B1), 氯代甲烷分子, 猝灭速率常数, 荧光寿命, 三能级模型

Abstract: CCl2 free radicals were produced by d-c discharge of CCl4(in Ar). The ground electronic state CCl2 radical was electronically excited to pR1 level of A1B1(0,4,0) state by laser exciting at 541.52 nm. Experimental quenching data of·CCl2(A1B1 and a3B1) through methane and chloromethane were obtained by observing time resolved fluorescence from the excited ·CCl2 transition, which showed a superposition of two exponential decay components. The state resolved rate constants kq1, kq2 and kq3 were first time estimated by analyzing and dealing with these data by using three level energy model, which was put forward by us. In combining discharge with free jet LIFthe lifetimes of·CCl2(A→X) and(a→X) transition were measured being(0.83±0.03) μs and(3.12±0.25) μs, respectively.

Key words: CCl2(A1B1, a3B1), Chloromethane, Quenching rate constant, Fluorescence lifetime, Three level energy model

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