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Rampant changes in 5f 5/2 and 5f 7/2 filling across the light and middle actinide metals: Electron energy-loss spectroscopy, many-electron atomic spectral calculations, and spin-orbit sum rule

DOI: 10.1103/PhysRevB.76.073105 DOI Help

Authors: K. Moore (Lawrence Livermore National Laboratory, USA.) , G. Van Der Laan (Diamond Light Source) , M. Wall (Lawrence Livermore National Laboratory, USA.) , A. Schwartz (Lawrence Livermore National Laboratory, USA.) , R. Haire (Oak Ridge National Laboratory, USA.)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 76 (7)

State: Published (Approved)
Published: August 2007

Abstract: We examine the branching ratio of the N4,5 (4d-5f) spectra of Th, U, Np, Pu, Am, and Cm metals using electron energy-loss spectroscopy (EELS) in a transmission electron microscope, together with many-electron atomic spectral calculations and the spin-orbit sum rule. Our results show the following. (1) The actinide metals Pu, Am, and Cm exhibit intermediate coupling. (2) The intermediate coupling values for the 5f states as calculated using a many-electron atomic model are correct for the actinides; this being proven by our results for curium. (3) The EELS branching ratio is sensitive to the degree of 5f electron delocalization, which is illustrated by the transition from LS to intermediate coupling between U and Pu.

Subject Areas: Physics

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