Abstract
The optical absorption spectrum of manganese in rhodonite studied both at room and liquid-air temperatures has revealed interesting results. The observed absorption bands have been identified as those belonging to Mn 2+. From the fine structure observed for one of the bands [assigned to the 4T 2(D) state] at liquid-air temperature the spin-orbit coupling coefficient ξ for Mn 2+ in rhodonite has been calculated. From the polarization characteristics and the splitting observed in one of the bands assigned to the 4E(G) level, it has been concluded that the site symmetry of Mn 2+ in rhodonite is slightly lowered from octahedral to tetragonal. The crystal-field parameters which gave a good fit to the observed band positions are: B = 760 cm −1; C = 3290 cm −1; Dq = 750 cm −1 and ξ = 390 cm −1.
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