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Systematic Trends in Non-resonant Inelastic X-ray Scattering of Actinides

Published online by Cambridge University Press:  23 May 2012

Gerrit van der Laan
Gerrit van der Laan*
Affiliation:
Diamond Light Source, Didcot, Oxfordshire OX11 0DE, United Kingdom SEAES, University of Manchester, Manchester, United Kingdom
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Abstract

Nonresonant inelastic x-ray scattering (NIXS) measurements probing the 5d → 5f electronic transitions at the uranium O4,5 edges in a localized electron system such as UO2 show a good agreement with many-electron atomic spectral calculations. The higher multipole spectra are split into two peaks that can be assigned as the 5d5/2 and 5d3/2 structures, despite the large electrostatic interactions. A new sum rule for the branching ratio of spin-orbit split core levels in electric multipole spectra, which generalizes the sum rule for dipole transitions in x-ray absorption spectroscopy, allows for a systematic analysis of the NIXS spectra. The branching ratio is linearly proportional to the expectation value of the angular part of the spin-orbit interaction in the initial state, where the rank of the multipole determines the coefficient of the linear dependence. This spin-orbit sum rule can be an important diagnostic tool for high-energy spectroscopies.

Keywords

Unuclear materialselectron energy loss spectroscopy (EELS)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1444: Symposium S/Y – Actinides and Nuclear Energy Materials , 2012 , mrss12-1444-y08-02
Copyright
Copyright © Materials Research Society 2012

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References

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