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化学学报
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化学学报 ›› 1994, Vol. 52 ›› Issue (2): 127-131. 上一篇    下一篇

研究论文

(CX~3)~2CO,CF~3COX和CXCl~3(X=H或D)对CH(A,B)自由基的猝灭

陈从香;冉琴;俞书勤;马兴孝   

  1. 中国科学技术大学近代化学系
  • 发布日期:1994-02-15

Collisional quenching of CH(A,B) radicals by (CX~3)~2CO, CF~3CO~2X and CXCl~3 (X=H or D) molecules

CHEN CONGXIANG;RAN QIN;YU SHUQIN;MA XINGXIAO   

  • Published:1994-02-15

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本文报道室温下用266nm激光光解-荧光猝灭方法测定CH~3COCH~3,CD~3COCD~3,CF~3CO~2H,CF~3CO~2D,CHCl~3和CDCl~3分子猝灭电子激发态CH(A,B) 自由基的速率常数,考察了含不同同位素原子的猝灭剂分子对CH(A,B)猝灭的同位素效应. 实验发现,含D的分子比相应含H的分子对CH(A,B)的猝灭具有更大的速率常数

关键词: 反应动力学, 激发态, 游离基, 同位素效应, 分子碰撞, 猝灭, 激光光解

The quenching rate constants of CH(A, B) radicals by CH3COCH3, CD3COCD3, CF3CO2H, CF3CO2D, CHCl3 and CDCl3 mols. were measured at 290 K by laser photodissocn.-fluorescence quenching technique. The discussion of isotopic effect of quencher on quenching rate constant is presented. It is found that the quenching cross sections by D substituted quencher is biger than that by H substituted one.

Key words: REACTION KINETICS, EXCITED STATE, FREE RADICAL, ISOTOPE EFFECT, MOLECULE COLLISIONS, QUENCHING

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