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Title: Consequences of electron correlation for XPS binding energies: Representative case for C(1s) and O(1s) XPS of CO
Author: Bagus, Paul S.
Sousa Romero, Carmen
Illas i Riera, Francesc
Keywords: Espectroscòpia de raigs X
Teoria quàntica relativista
X-ray spectroscopy
Relativistic quantum theory
Issue Date: 2016
Publisher: American Institute of Physics
Abstract: In this paper, we present a study of the signs and the magnitudes of the errors of theoretical binding energies, BE's, of the C(1s) and O(1s) core-levels compared to BE's measured in X-Ray photoemission, XPS, experiments. In particular, we explain the unexpected sign of the error of the Hartree-Fock C(1s) BE, which is larger than experiment, in terms of correlation e↵ects due to the near degeneracy of the CO(1⇡) and CO(2⇡) levels and show how taking this correlation into account leads to rather accurate predicted BE's. We separate the initial state contributions of this near degeneracy, present for the ground state wavefunction, from the final state near degeneracy e↵ects, present for the hole state wavefunctions. Thus, we are able to establish the importance for the core-level BE's of initial state charge redistribution due to the ⇡ near-degeneracy. While the results for CO are interesting in their own right, we also consider whether our conclusions for CO are relevant for the analysis of XPS spectra of a wider range of molecules.
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It is part of: Journal of Chemical Physics, 2016, vol. 145, p. 144303
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ISSN: 0021-9606
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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