High-resolution photofragment translational spectra of the photodissociation of CF3I at 248 nm

The photodissociation of CF3I at 248 nm was performed on our high-resolution photofragment translational spectrometer. For further improvement of the resolution, we have taken the following procedures: (1) Kr was used as carrier gas, (2) optimum molecular beam angle θopt (when VMB⊥VCM) was selected, (3) the longitudinal molecular beam angle spread was reduced, and (4) the ionization region for photofragments was diminished. The photofragment translational spectra of I* (2P1/2) reveal eight well-resolved vibrational peaks. The highest peak was assigned to be v2=5 of the ν2 vibrational mode, and then the dissociation energy would be D0(C–I)=18 810±200cm−1=53.8±0.6 kcal/mol.