用交叉束激光诱导荧光技术研究氟原子与碘化物的反应

在570-620 nm波长范围内用交叉束激光诱导荧光技术研究了F原子与C_2H_5I, C_2F_5I和C_3H_5I的反应, 获得了反应产物IF的振功和转功激发谱; 测得了反应产物IF在v=3, 4和5能级中的初生相对振动布居密度, 和部分的相对细致振动速率常数, 转动温度和振功能级中转动能量的平均部分数; 并对反应机制进行了讨论。

THE REACTIONS OF FLUORINE ATOMS AND IODIDES HAS BEEN STUDIED BY THE CROSSED BEAM LASER-INDUCED FLUORESCENCE TECHNIQUE

The reactions of F atoms with C_2H_I, C_2F_5I, and C_3H_5I has been studied by the crossed beam laser-induced fluorescence technique within the 570-620 nm wa- velength region. The vibrational and rotational excitation spectra of the reaction product IF were measured. The relative vibrational population densities of v=3, 4, and 5 vibrational levels, and some of the relative fine vibrational rate con- stants, the rotational temperatures, and the mean fractions of rotational energy in individual vibrational states of the reaction product IF were obtained.The experimental results show that the vibrational state distributions for the products of the reactions F+C_2H_5I and F+C_2F_5I among the v=3, 4 and 5 levels are essentially statistical. This indicates that mechanism of indirect reaction exists in the reactions of F atoms with iodides of saturated or fluorinated polyatomic radicals. The vibrational state distributions for the product of the reaction F+C_3H_5I exhibits population inversion among the v=3, 4 and 5 leveles. This indicates that mechanism of direct reaction exists in the reactions of F atoms with iodides of unsaturated polyatomic radicals.