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

The reactions of F atoms with C2H5I, C2F5I, and C3H5I has been studied by the crossed beam laser-induced fluorescence technique within the 570-620 nm wavelength 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 constants, 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 + C2H5I and F + C2F5I among the v = 3, 4, and 5 levels are essentially statistical. This indicates that mechanism of indirect reaction exists in the reaction of F atoms with iodides of saturated or fluorinated polyatomic radicals. The vibrational state distributions for the product of the reaction F + C2H5I exhibits population inversion among the v = 3, 4, and 5 levels. This indicates that mechanism of direct reaction exists in the reactions of F stoms with iodides of unsaturated polyatomic radicals.