First-principles study of phonon effects in x-ray absorption near-edge structure spectroscopy
Résumé
Usually first-principles x-ray absorption near-edge structure (XANES) calculations are performed in the Born-Oppenheimer approximation assuming a static lattice, whereas the nuclear motion undoubtedly impacts XANES spectra notably at the K pre-edge of light elements in oxides. Here, an efficient method based on density-functional theory to account for quantum thermal fluctuations of nuclei is developed and is successfully applied to the K edge of corundum for temperatures up to 930 K. The zero-point motion influence is estimated. Comparison is made with previous theoretical approaches also developed to account for vibrations in XANES.
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Nemausat_2016_J._Phys.__Conf._Ser._712_012006.pdf (776.62 Ko)
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| Origine | Publication financée par une institution |
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