摘要
对CCl4 /Ar混合气体脉冲直流高压放电产生CCl2 自由基 ,经过约 110 μs后 ,再用541.52nm激光将电子基态CCl2 激励到激发态A1B1( 0 ,4 ,0 )振动态K =0能级上 ,通过检测激发态CCl2 (A)时间分辨荧光信号 ,测得室温下CCl2 (A1B1和a3B1)被酮类分子猝灭的实验结果 ,用所提出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。
CCl 2 free radicals were produced by dc discharge of CCl 4(in Ar). Ground electronic state CCl 2 radical was electronically excited to A 1B 1(0,4,0) state with Nd:YAG laser pumped dye laser at 541.52nm. Experimental quenching data of CCl 2 (A 1B 1 and a 3B 1) by several ketones were obtained through observing time resolved fluorescence signal of the excited CCl 2 radicals, which showed a superposition of two exponential decay components. The state-resolved rate constants K A and K a were first time acquired by analyzing and dealing with these data by using three-level-model, which was put forward by us. K A and K a increase on the whole with increasing the number of C-H bonds in ketones.
基金
国家自然科学基金 ( 2 99730 380 )
中国科学院重大项目 (HH0 30 30 1)
国家重点基础研究专项基金(G19990 7530 4 )资助项目&&
