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The nuts and bolts of core-hole constrained ab initio simulation for K-shell x-ray photoemission and absorption spectra
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Klein, Benedikt P., Hall, Samuel J. and Maurer, Reinhard J. (2021) The nuts and bolts of core-hole constrained ab initio simulation for K-shell x-ray photoemission and absorption spectra. Journal of Physics: Condensed Matter, 33 (15). 154005. doi:10.1088/1361-648x/abdf00 ISSN 1361-648X.
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Official URL: https://doi.org/10.1088/1361-648x/abdf00
Abstract
Abstract: X-ray photoemission (XPS) and near edge x-ray absorption fine structure (NEXAFS) spectroscopy play an important role in investigating the structure and electronic structure of materials and surfaces. Ab initio simulations provide crucial support for the interpretation of complex spectra containing overlapping signatures. Approximate core-hole simulation methods based on density functional theory (DFT) such as the delta-self-consistent-field (ΔSCF) method or the transition potential (TP) method are widely used to predict K-shell XPS and NEXAFS signatures of organic molecules, inorganic materials and metal–organic interfaces at reliable accuracy and affordable computational cost. We present the numerical and technical details of our variants of the ΔSCF and TP method (coined ΔIP-TP) to simulate XPS and NEXAFS transitions. Using exemplary molecules in gas-phase, in bulk crystals, and at metal–organic interfaces, we systematically assess how practical simulation choices affect the stability and accuracy of simulations. These include the choice of exchange–correlation functional, basis set, the method of core-hole localization, and the use of periodic boundary conditions (PBC). We particularly focus on the choice of aperiodic or periodic description of systems and how spurious charge effects in periodic calculations affect the simulation outcomes. For the benefit of practitioners in the field, we discuss sensible default choices, limitations of the methods, and future prospects.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Chemistry > Computational and Theoretical Chemistry Centre |
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SWORD Depositor: | Library Publications Router | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Photoemission, Density functionals , X-ray absorption fine structure, X-ray absorption near edge structure , Metal-organic frameworks | |||||||||||||||
Journal or Publication Title: | Journal of Physics: Condensed Matter | |||||||||||||||
Publisher: | IOP Publishing | |||||||||||||||
ISSN: | 1361-648X | |||||||||||||||
Official Date: | 26 February 2021 | |||||||||||||||
Dates: |
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Volume: | 33 | |||||||||||||||
Number: | 15 | |||||||||||||||
Article Number: | 154005 | |||||||||||||||
DOI: | 10.1088/1361-648x/abdf00 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
Date of first compliant deposit: | 18 May 2021 | |||||||||||||||
Date of first compliant Open Access: | 18 May 2021 | |||||||||||||||
RIOXX Funder/Project Grant: |
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