Metastability and fragmentation of the OCS³⁺ states produced by S 2p double Auger decay

The metastability and the dissociation processes of the OCS³⁺ states produced by the S 2p double Auger decay of OCS are investigated by multi-electron-ion coincidence spectroscopy using a magnetic bottle electron spectrometer. The spectra of the OCS³⁺ states filtered for the production of individual ions are derived by four-fold (or five-fold) coincidence among three electrons and a product ion (or two ions). The ground OCS³⁺ state is confirmed to be metastable in the 10 µs regime. The OCS³⁺ states relevant to the individual channels of two- and three-body dissociations are clarified.