Photofragmentation of C, F and S K-shell excited CF3SF5 studied by PEPICO and PIPICO spectroscopy

Photodecomposition of K-shell excited CF3SF5 was investigated by means of photoelectron-photoion coincidence (PEPICO) and photoion-photoion coincidence (PIPICO) spectroscopy. In PEPICO mode to study site-selective fragmentation, the yield of CF3+ was high at the C1s→σCS∗ excitation and that of SF3+ was considerable at the excitation into σCF∗. When the F K-shell of SF5 was selectively excited, the formation of CF3+ was prominent. The atomic ions of S+ and F+ were overwhelmingly produced with some amounts of S2+ and S3+ ions at the S K-shell excitation. Formation of highly charged CF3SF5n+(n=2-4) ions was confirmed by PIPICO spectroscopy. The yields of CF3SF5n+(n=3,4) were low at the S1s→σSF∗ excitation. Breakdown pathways of the CF3SF5n+ ions were discussed.