Abstract
Magnetic circular polarization of the emission produced by A-band excitation in KI:Sn 2+ has been obtained. At low temperatures, when the field is applied along 〈001〉, the emission shows a net negative circular polarization; however, when the field is along 〈111〉, the emission shows the usual positive circular polarization. The unexpected negative polarization can be explained qualitatively by the effect of a charge-compensating vacancy located in the nearest neighbor position.
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