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- W1971684265 abstract "When an inhomogeneous electron gas is subjected to a perturbation, its energy and density both change by small amounts. We calculate the changes in the energy explicitly in terms of the density changes within the density-functional theory of many-electron systems. We also derive the equations for the induced densities, and using these show that a density correct up to order n in terms of the perturbation parameter is sufficient to give energy changes up to order (2n + 1). As a corollary, the even-order energy changes E(2n) are variational with respect to the density changes ϱ(n). The equations for the induced densities also follow from this corollary. The even-order corollary also gives a variational method of calculating the induced densities. The theory is demonstrated by applying it to calculate the polarizability and hyperpolarizability of the hydrogen, helium and neon atoms." @default.
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- W1971684265 date "1996-11-01" @default.
- W1971684265 modified "2023-09-27" @default.
- W1971684265 title "Perturbation theory in terms of electron density" @default.
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- W1971684265 doi "https://doi.org/10.1016/0375-9601(96)00675-5" @default.
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