Ion-Pair Photodissociation of Trichloromonofluoromethane

Anionic fragments, F^- and Cl^- including two isotope species ³⁵Cl^- and ³⁷Cl^-, are ob-served in the photoexcitations of CFCl₃. The ion-pair anion e±ciency spectra of ³⁵Cl^- and ³⁷Cl^- are recorded in the photon energy range of 7.75～22.00 eV. The threshold of ion-pair dissociation CFCl₃→CFCl₂⁺+Cl^- is experimentally determined to be 7.94±0.04 eV. With the references of the high-resolution photoabsorption spectra reported in the literatures, we make tentative assignments of the electron valence-to-Rydberg transitions. Furthermore, the multibody ion-pair fragmentation processes to Cl^- are discussed by comparison between the calculated thermochemical thresholds and the experimental efficiency spectrum.