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Sub-natural linewidth spectroscopy on core–valence doubly ionized states of OCS

Core–valence doubly ionized states of OCS, which are produced by the Coster–Kronig transitions following the S 2s ionization, have been investigated by using threshold photoelectron-Auger electron coincidence spectroscopy. The sub-natural linewidth regime achieved with this coincidence method enables us to locate the core–valence OCS2+ states, while the corresponding structures are almost smeared out on the S 2s Auger spectrum measured with conventional Auger electron spectroscopy.