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- W4386462065 abstract "Hubbard U-corrected density functional theory within the periodic boundary condition model in the WIEN2k code is used to simulate the actinide LIII and O K edge X-ray absorption near-edge structure (XANES) for UO2 and PuO2. Spin-orbit coupling effects are included, as are possible excitonic effects using supercells with a core hole on one of the atoms. Our calculations yield spectra in excellent agreement with previous experiments and superior to previous simulations. Density of states analysis reveals the mechanism behind the XANES peaks: the main contribution to the U/Pu LIII edges comes from the U/Pu d states hybridized with O p states, while as expected, the O p states primarily determine the O K edges of both UO2 and PuO2. The O K edges also feature O p hybridizing with U/Pu d and f states in the low-energy region and with U/Pu s and p states for the higher-energy peaks." @default.
- W4386462065 created "2023-09-06" @default.
- W4386462065 creator A5022722852 @default.
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- W4386462065 date "2023-09-05" @default.
- W4386462065 modified "2023-09-29" @default.
- W4386462065 title "DFT + <i>U</i> Simulation of the X-ray Absorption Near-Edge Structure of Bulk UO<sub>2</sub> and PuO<sub>2</sub>" @default.
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- W4386462065 doi "https://doi.org/10.1021/acs.jpcc.3c03143" @default.
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