Effects of X-irradiation on the Principal Uranium Centre in Alkali Fluorides
Keyword(s):
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.
1985 ◽
Vol 18
(11)
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pp. 2381-2391
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1989 ◽
Vol 93
(8)
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pp. 2999-3011
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1985 ◽
Vol 260
(12)
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pp. 7368-7378
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