Observation of 5f intermediate coupling in uranium x-ray emission spectroscopy

Tobin, J. G.; Nowak, S.; Yu, S-W; Alonso-Mori, R.; Kroll, T.; Nordlund, D.; Weng, T-C; Sokaras, D.

doi:10.1088/2399-6528/ab6940

Title: Observation of 5f intermediate coupling in uranium x-ray emission spectroscopy

Journal Article · 17 January 2020 · Journal of Physics Communications

DOI: https://doi.org/10.1088/2399-6528/ab6940 · OSTI ID:1592176

^[1]; Nowak, S. ^[2]; Yu, S-W ^[3]; Alonso-Mori, R. ^[2]; Kroll, T. ^[2]; Nordlund, D. ^[2]; Weng, T-C ^[2]; Sokaras, D. ^[2]

Univ. of Wisconsin-Oshkosh (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The first observation of Intermediate Coupling effects in the occupied 5f states has been made using x-ray Emission Spectroscopy (XES). In the past, the impact of Intermediate Coupling of the 5f states in actinides has long been observed and quantified, using x-ray Absorption Spectroscopy (XAS) to probe the unoccupied 5f states, providing great insight into the enigma of 5f electronic structure. However, no measure of its effects in the occupied states had been reported before this. Moreover, because the 5f occupied states in UF₄ are almost completely of 5f_5/2 character, the observed effect in XES is twice that in XAS for UF₄.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Renewable Energy. Solar Energy Technologies Office; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1592176

Alternate ID(s):: OSTI ID: 1582452; OSTI ID: 1597210

Report Number(s):: LLNL-JRNL-787893; 984584

Journal Information:: Journal of Physics Communications, Vol. 4, Issue 1; ISSN 2399-6528

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
x-ray emission
actinides
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Title: Observation of 5f intermediate coupling in uranium x-ray emission spectroscopy

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