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Dobrowolska, A.P. (author), Dierre, B.F.P.R. (author), Fang, C.M. (author), Hintzen, H.T.J.M. (author), Dorenbos, P. (author)Structural and optical properties of MGa2S4 (M = Mg, Zn, Ca, Sr, Ba) compounds have been compared, and the vacuum referred binding energy (VRBE) schemes were constructed for the lanthanide ions in the iso-structural compounds CaGa2S4 and SrGa2S4 employing literature data. The VRBE of an electron in the 5d excited state of Eu2+ was found at 0.75...journal article 2016