Auger-electron—photoion and photoion—photoion coincidence studies on ionic fragmentation of SF 6 following the S L-shell excitation

Abstract

Auger-electron—photoion coincidence study of SF 6 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.