(CX_3)_2CO,CF_3COX和CXCl_3(X=H或D)对CH(A,B)自由基的猝灭

Colliaional Quenching of CH (A, B) Radicals by(CX_3)_2CO,CF_3CO_2X and CXCl_3 (X = H or D) Molecules

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.

The quenching rate constants of OH(A, B) radicals by OH3OOOHS, CD3COCD3, CF3CO2H, CF3CO2D, OHCl3 and CDCl3 molecules were measured at 290 K by means of laser at 266nm photodissociation-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.