Absorption and luminescence spectroscopy of manganese-doped BaSO 4 crystals

Abstract

The polarized 10 K single-crystal absorption spectra of Mn-doped BaSO 4 are reinterpreted and the first luminescence spectra are presented. As a consequence of the high-temperature preparation there is a simultaneous presence of MnO 3− 4 and MnO 2− 4 in the BaSO 4 host with a ration close to one. This is mainly responsible for the erroneous assignments in the literature. The broad absorption bands between 10000 and 16500 cm −1are due to 3 A 2 → 3 T 2, 3 T 1 ( d → d) transitions of the MnO 3− 4 ion. The 2 E → 2 T 2 ( d → d) transition of MnO 2− 4 originates at 11074 cm −1.