期刊
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
卷 18, 期 3, 页码 1569-1583出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jctc.1c011801569-1583
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资金
- COST (European Cooperation in Science and Technology) [CA18234]
- National Science Foundation [OAC1740204]
- Academy of Finland [316168]
- Emmy Noether Programme of the German Research Foundation [453275048]
- Academy of Finland (AKA) [316168, 316168] Funding Source: Academy of Finland (AKA)
This article presents an accurate computational approach to calculate absolute K-edge core electron excitation energies using numeric atom-centered orbitals (NAOs). The method is validated by comparing the results with experimental data and demonstrates excellent agreement.
We present an accurate computational approach to calculate absolute K-edge core electron excitation energies as measured by X-ray absorption spectroscopy. Our approach employs an all-electron energies (BSE@GW) using numeric atom-centered orbitals (NAOs). The BSE@GW method has become an increasingly popular method for the computation of neutral valence excitation energies of molecules. However, it was so far not applied to molecular K-edge excitation energies. We discuss the influence of different numerical approximations on the BSE@ GW calculation and employ in our final setup (i) exact numeric algorithms for the frequency integration of the GW self-energy, (ii) G0W0 and BSE starting points with similar to 50% of exact exchange, (iii) the Tamm-Dancoff approximation and (iv) relativistic corrections. We study the basis set dependence and convergence with common Gaussian-type orbital and NAO basis sets. We identify the importance of additional spatially confined basis functions as well as of diffuse augmenting basis functions. The accuracy of our BSE@GW method is assessed for a benchmark set of small organic molecules, previously used for benchmarking the equation-ofmotion coupled cluster method [Peng et al., J. Chem. Theory Comput., 2015, 11, 4146], as well as the medium-sized dibenzothiophene (DBT) molecule. Our BSE@GW results for absolute excitation energies are in excellent agreement with the experiment, with a mean average error of only 0.63 eV for the benchmark set and with errors <1 eV for the DBT molecule.
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