Abstract
High flux and pulsed photons from FEL are very fascinating for the study of photochemistry. In advance of future application of X-ray-FEL, we have investigated the mechanism of the bond-selective fragmentation occurring at the surface of fluorinated graphite following F Is core-excitation using time-of-flight mass-spectroscopy (TOF-MS) combined with pulsed synchrotron radiation. Excitation-energy dependence of F+ fragment yields revealed that C-F bonds are selectively broken by F Is resonant excitation. Furthermore, translation-energy-resolved excitation spectra of F+-yields were measured using TOF technique. Slow fragments were found to be involved in the specific dissociation. The result was explained assuming that Auger decay followed by F Is → O∗C-F resonance leaves a long-lived excited electron at O∗C-F orbital in precursor states, which should be highly antibonding and promote breaking C-F bonds. PACScodes: 32.80.Hd, 68.43.Tj, 82.50.Kx
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