Auger-electron-photoion and photoion-photoion coincidence studies on ionic fragmentation of SF₆ following the S L-shell excitation

Auger-electron-photoion coincidence study of SF₆ excited by 196 eV photons shows that the dications having two holes in the outer-valence bands dissociate into various ionic fragments, while those having one hole in the outer-valence and one hole in the inner-valence (F 2s) bands mostly dissociate into atomic ionic fragments F⁺ and S⁺. Measurement of photoion-photoion coincidence efficiency curves in the S 2p threshold region reveals that not only the S 2p→t_2g and e_g excitation above the S 2p threshold but also the S 2p→a_1g excitation below the S 2p threshold enhance the ion-pair formation, suggesting that a considerable part of the resonance-Auger-final states are subject to autoionization.