CH(A^2△和B^2∑^-)和醇类分子碰撞过程动力学研究  

Kinetic Study of CH(A,B) Quenching Process by Alcohol Molecules

作　　者：陈从香[1] 盛悦[1] 戴继勋 马兴孝[1] 

机构地区：[1]中国科技大学化学物理系,合肥230026

出　　处：《化学学报》1995年第6期573-577,共5页Acta Chimica Sinica

基　　金：国家自然科学基金资助课题

摘　　要：本文报道用四倍频YAG激光(266nm)光解CHBr_3产生电子激发态CH(A,B)自由基和测量自发辐射CH(A,B→X)的时间分辨信号的方法测定了室温(290K)下 CH(A,B)被醇类分子(乙醇、异丙醇、正丁醇、异戊醇和叔戊醇)猝灭的速率常数,实验测定的CH(A)和 CH(B)猝灭速率常数K_q^A和K_q^B(单位为10^(-10)cm^3·molecule^(-1)·s^(-1))值如下(误差为线性拟合的标准偏差):此外,还从碰撞配合物模型出发,就醇分子中OH基对猝灭速率常数的影响作了讨论.The quenching rate constants of CH(A and B) by alcohol Molecules were measured by using laser photolysis (at 266nm) of CHBr3 to produce CH(A,B) and the observation of time resolved fluorescence CH(A,B→X) methods. The measured results are as follows (units of kq in 10-10cm3 · molecule-1 · s-1; the uncertainty is a standard deviation of least-squares fitting):C2H5OH: kqA=5.3±0.2 kqB=7.9±0.6i-C3H7OH: kqA=6.1±0,2 kqB= 7.4±0.8n-C4H9OH: kqA = 6.8±0.7 kqB=9.4±2.0i-C5H11OH: kqA = 7.2±0.2 kqB = 11.4±1.4t-C5H11OH: kqA= 5.3±0.4 kqB=9.3±1.0A discussion of the effect of OH group in alcohol on the quenching of CH(A,B) is presented based on the collision complex model.

关 键 词：CH自由基 醇 配合物 碰撞模型 碰撞动力学 

分 类 号：O643.1[理学—物理化学]