化学学报 ›› 1998, Vol. 56 ›› Issue (6): 570-574. 上一篇    下一篇

研究论文

CH(A^2Δ)自由基被醇类分子猝灭动力学的温度效应研究

陈从香;王非;陈益新;冉琴;马兴孝   

  1. 中国科学技术大学化学物理系
  • 发布日期:1998-06-15

Temperature effect on quenching of CH(A) by alcohol

CHEN CONGXIANG;WANG FEI;CHEN YIXIN;RAN QIN;MA XINGXIAO   

  • Published:1998-06-15

用266nm激光光解CHBr3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。

关键词: 乙醇, 丁醇, 醇, 溴甲烷, 丙醇, 温度效应, 猝灭动力学

The quenching rate constants of CH(A^2Δ) 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.

Key words: ETHANOL, BUTANOL, ALCOHOL, METHYL BROMIDE, PROPANOL, TEMPERATURE EFFECT

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