铀氧化物的X射线吸收和发射光谱研究
Uranium oxides investigated by X-ray absorption and emission spectroscopies
摘要：
本文介绍了铀氧化物UO_2、U_3O_8和UO_3在O_（1s）边的X射线吸收和共振X射线发射的测量结果。UO3的O Kα X射线发射谱的谱形表现出明显的激发能依赖性，从不对称到对称的变化，这与UO2和U3O8的谱形不同。这种能量依赖性归因于在UO 3的晶体结构中的两个不同位点之间的氧铀杂化的显著差异。UO_2和U_3O_8的光谱形状也不同，但没有明显的能量依赖性。的铀氧化物的价带和导带的实验光谱进行比较，在文献中的电子结构计算的结果。
英文摘要：
X-ray absorption and resonant X-ray emission measurements at the O 1s edge of the uranium oxides UO2, U3O8 and UO3 are presented. The spectral shapes of the O Kα X-ray emission spectra of UO3 exhibit significant excitation energy dependence, from an asymmetric to a symmetric form, which differs from those of UO2 and U3O8. This energy dependence is attributed to a significant difference in the oxygen-uranium hybridization between two different sites in the crystal structure of UO3. The spectral shapes of UO2 and U3O8 are also found to be different but without significant energy dependence. The experimental spectra of the valence and conduction bands of the uranium oxides are compared to the results of electronic structure calculations available in the literature.
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