Short Notes K65 phys. stat. sol. (b) _ . 146, K65 (1988) Subject classification: 78.40 and 78.55; 71.35; S8.11 Sektion Physik der Humboldt-UniversitBt zu Berlin, Bereich Halbleiteroptikl) Energy Gap of MnS BY 0. GOEDE, W. HEIMBRODT, M . LAMLA, andV. WEINHOLD The continuous interest in the (Zn, Mn) and (Cd, Mn) chalcogenides as typical diluted magnetic semiconductors /1, 2/ has also attracted new attention to the pure M n chalcogenides as the limiting components of these mixed crystals.