CCl_2(A^1B_1)被O_2及取代甲烷类分子猝灭的动力学研究  

Kinetics Studies on Quenching of CCl_2CA^1B_1 and a^3B_1 by O_2, CF_4 CF_2Cl_2 , CH_3NO_2 , CH_2Br_2 and Chloromethane

作　　者：高义德[1] 胡长进[1] 陈旸[1] 戴静华[1] 陈从香[1] 

机构地区：[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

出　　处：《高等学校化学学报》2002年第5期906-909,共4页Chemical Journal of Chinese Universities

基　　金：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.

摘　　要：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．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 YAG laser pumped dye laser at 541. 52 nm. Experimental quenching data of CClz(.A1B1 and a3B1) by O2, CF4, CF2Cl2, CH3NO2, CH2Br2 and chloromethane were obtained by observing time resolved fluorescence from the excited CC12 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.

关 键 词：动力学 猝灭速率常数 取代甲烷分子 氧分子 CCL2自由基 二氯卡宾 

分 类 号：O643.1[理学—物理化学]