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Experimental verification of the need for either jj or intermediate coupling in the 5f states of plutonium

Published online by Cambridge University Press:  01 February 2011

K. T. Moore ,
M. A. Wall ,
A. J. Schwartz ,
B. W. Chung ,
J. G. Tobin ,
D. K. Shuh  and
R. K. Schulze
K. T. Moore
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
M. A. Wall
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
A. J. Schwartz
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
B. W. Chung
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
J. G. Tobin
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
D. K. Shuh
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, CA 94720
R. K. Schulze
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 8754
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Abstract

Here, we demonstrate the power of electron energy-loss spectroscopy (EELS) in a transmission electron microscope (TEM) to investigate the electronic structure plutonium. Using EELS, TEM, and synchrotron-radiation-based X-ray absorption spectroscopy (XAS), we provide the first experimental evidence that Russell-Saunders (LS) coupling fails for the 5f states of Pu. These results support the assumption that only the use of jj or intermediate coupling is appropriate for the 5f states of Pu. EELS experiments were performed in a TEM and are coupled with image and diffraction data, therefore, the measurements are completely phase specific. It is shown that EELS in a TEM may be used to circumvent the difficulty of producing single-phase or single-crystal samples due to its high spatial resolution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 802: Symposium DD – Actinides - Basic Science, Applications, and Technology , 2003 , DD2.6
Copyright
Copyright © Materials Research Society 2004

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