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• W1997948988 abstract "Correlated electron densities, experimental ionisation potentials, and experimental electron affinities are used to investigate the homogeneity of the exchange–correlation and non-interacting kinetic energy functionals of Kohn–Sham density functional theory under density scaling. Results are presented for atoms and small molecules, paying attention to the influence of the integer discontinuity and the choice of the electron affinity. For the exchange–correlation functional, effective homogeneities are highly system-dependent on either side of the integer discontinuity. By contrast, the average homogeneity—associated with the potential that averages over the discontinuity—is generally close to 4/3 when the discontinuity is computed using positive affinities for systems that do bind an excess electron and negative affinities for those that do not. The proximity to 4/3 becomes increasingly pronounced with increasing atomic number. Evaluating the discontinuity using a zero affinity in systems that do not bind an excess electron instead leads to effective homogeneities on the electron abundant side that are close to 4/3. For the non-interacting kinetic energy functional, the effective homogeneities are less system-dependent and the effect of the integer discontinuity is less pronounced. Average values are uniformly below 5/3. The study provides information that may aid the development of improved exchange–correlation and non-interacting kinetic energy functionals." @default.
• W1997948988 created "2016-06-24" @default.
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• W1997948988 date "2012-01-17" @default.
• W1997948988 modified "2023-09-27" @default.
• W1997948988 title "Effective homogeneity of the exchange–correlation and non-interacting kinetic energy functionals under density scaling" @default.
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• W1997948988 doi "https://doi.org/10.1063/1.3676722" @default.
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