Absorption spectra and primary photolysis processes of some fluorinated organic compounds in the near and vacuum ultraviolet

Measurements were made of the absorption coefficients of RJ=CF₃J, C₃F₇J, CF₃CFJCF₃, and CF₃OCF₂CF₂J in the 120–320 nm spectral range. Investigations were made of the photodissociation processes of CF₃OCF₂CF₂J at λ=254 nm and of the spectral dependences of the main photodissociation processes of RI in the first two vacuum ultraviolet (VUV) bands (155–175 nm). The photodissociation of CF₃OCF₂CF₂J at λ=254 nm with the quantum efficiency Φ_J*=1.0^–0.05 produced iodine atoms in the first excited state. The main photodecomposition processes of RI in the first VUV band (~160–175 nm) were the predissociation reactions of RI to form R and J(²P_3/2) with Φ_J=0.76 ± 0.09 (C₃F₇J) and 1.0 ± 0.1 (CF₃J). In the second VUV band the main mechanism of degradation of the excitation energy, at least for the perfluoropropyl iodides, were nonradiative internal conversion processes.