Measurement of the Auger parameter and Wagner plot for uranium compounds

作者：Holliday Kiel S^*; Siekhaus Wigbert; Nelson Art J

来源：Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films , 2013, 31(3): 031401.

DOI：10.1116/1.4793477

In this study, the photoemission from the U 4f(7/2) and 4d(5/2) states and the U N6O45O45 and N67O45V x-ray excited Auger transitions were measured for a range of uranium compounds. The data are presented in Wagner plots and the Auger parameter is calculated to determine the utility of this technique in the analysis of uranium materials. It was demonstrated that the equal core-level shift assumption holds for uranium. It was therefore possible to quantify the relative relaxation energies, and uranium was found to have localized core-hole shielding. The position of compounds within the Wagner plot made it possible to infer information on bonding character and local electron density. The relative ionicity of the uranium compounds studied follows the trend UF4 > UO3 > U3O8 > U4O9/U3O7 approximate to UO2 > URu2Si2.

• 出版日期2013-5