Stability and Fragmentation of OCS2+ Studied by Using Auger-Electron-Ion Coincidence Measurement

An Auger-electron-ion coincidence method has been applied to investigate dissociation of OCS2+ states with two valence holes, which are populated via Auger decay following S 2p photoionization of OCS. We found that OCS2+ states lying around a binding energy of 32 eV are mostly stable against dissociation, which indicates that the potential energy surfaces of these OCS2+ states have deep wells around the Franck-Condon region. In contrast, the OCS2+ states lying around 34 eV and 42 eV dissociate predominantly into CO+ + S+ and O + C+ + S+, respectively.