
%0 Journal Article
%A Runciman, WA 
%A Srinivasan, B 
%T Effects of X-irradiation on the Principal Uranium Centre in Alkali Fluorides
%J Australian Journal of Physics
%D 1988/08/01
%V 41
%N 4
%P 611-622
%K 
%R https://doi.org/10.1071/PH880611
%U https://www.publish.csiro.au/paper/PH880611 
%X When fluorescing crystals of LiF and NaF containing hexavalent uranium and oxygen are X-irradiated the fluorescence is quenched and new absorption centres are created. There are strong absorption lines created at 562·8 nm in LiF: U, 0 and at 580·6 nm in N aF: U, O. These and other absorption lines have been studied by magnetic circular dichroism (MCD). A temperature independent MCD was observed, indicating an upper state degeneracy. A Fano antiresonance is observed in the absorption spectrum. No splitting was observed for the lines under uniaxial stress at 10 K. A model for these new centres is proposed. 
