CH(A^2△)自由基被醇类分子猝灭动力学的温度效应研究

Temperature Effect on Quenching of CH(A) by Alcohol

用266nm激光光解CHBr_3产生CH自由基,利用精密控温仪控制反应温度,测定CH(A→X)荧光的时间分辨信号,测量了290K至653K范围内CH(A)被乙醇、丙醇、丁醇猝灭的速率常数,利用修正的碰撞配合物模型,定性解释了在多极吸引势与活化势垒的双重影响下,猝灭截面与温度间的关系.

The quenching rate constants of CH(A2△) radical by alcohol molecules, such as C2H5OH, n -C3H7OH and n - C4H9OH, between 290K and 653K have been measured using laser photolysis of CHBr3 at 266nm to produce CH(A) radical and time - resolved fluorescence measurements. Under the simultaneous effects of multipole attractive potential and repulsive barrier, the temperature dependence is analyzed qualitatively based on a modified collision complex model.