Abstract
By means of magnetic circular dichroism of the optical absorption and photostimulated luminescence (PSL) the X-ray induced formation of FA and F centres in RbBr:(Ga+, Li+) was investigated. It turnes out that RbBr:Ga+ co-doped with 1% Li+ in the melt reveals the largest red-shift of the PSL excitation bands to 790 nm, whereby the FA to F ratio increases up to about 10% with decreasing X-ray dose. This is more than statistically expected (6%). High X-ray doses destroy FA centres. However, up to 15% of the simultaneously generated F centres could be converted into the FA species by appropriate bleaching with 633 nm light into the F centre absorption band.
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