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XPS study of the An5f electronic states in actinide (Th, U, Np, Pu, Am, Cm, Bk) compounds.

In the present work it was found that the relative intensity of the quasiatomic An5f- electron line correlates with the number n5f of such electrons in actinide compounds. The experimental dependence of the relative An5f line intensity for Th, U, Np, Pu, Am, Cm, and Bk in various compounds on the number n5f (I5f = 0.02 n5f) in the range from 0 to 7 was obtained. It gave a unique opportunity to determine the oxidation state of actinides in compounds, to conduct the X-ray photoelectron quantitative ionic analysis on the basis of the An5f line intensity, to study the participation degree of electrons in the chemical binding, and to carry out the comparison with the results of the theoretical calculations of the photoemission cross-sections.