CC BY 4.0 UnportedFeifel, R.Eland, J.H.D.Carniato, S.Selles, P.Püttner, R.Koulentianos, D.Marchenko, T.Journel, L.Guillemin, R.Goldsztejn, G.Travnikova, O.Ismail, I.Miranda, B. Cunha deLago, A.F.Céolin, D.Lablanquie, P.Penent, F.Piancastelli, M.N.Simon, M.2023-06-052023-06-052017https://oa.tib.eu/renate/handle/123456789/12397http://dx.doi.org/10.34657/11429Recent advances in X-ray instrumentation have made it possible to measure the spectra of an essentially unexplored class of electronic states associated with double inner-shell vacancies. Using the technique of single electron spectroscopy, spectra of states in CS2 and SF6 with a double hole in the K-shell and one electron exited to a normally unoccupied orbital have been obtained. The spectra are interpreted with the aid of a high-level theoretical model giving excellent agreement with the experiment. The results shed new light on the important distinction between direct and conjugate shake-up in a molecular context. In particular, systematic similarities and differences between pre-edge states near single core holes investigated in X-ray absorption spectra and the corresponding states near double core holes studied here are brought out.enghttps://creativecommons.org/licenses/by/4.0500600conjugateX rayX ray absorption spectroscopyArticle