The fragmentation of core ionized CF4 probed by threshold-photoelectron-photoion-photoion coincidence (TPEPIPICO) spectroscopy

The ionization and fragmentation of carbon tetrafluoride excited at the C a nd F 1s thresholds are studied using soft x-ray excitation, threshold elect ron spectroscopy and state-selective coincidence techniques. The threshold electron spectra reveal indirect low-energy production from pre-edge resona nces, and the structure at the thresholds is attributable to post-collision interaction effects, with some evidence of underlying vibrational structur e. The coincidence data allow determination of ion and ion pair yield ratio s and deduction of the dissociation pathways and final states for the vario us channels.