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• W2095505877 abstract "It is well known that time-dependent density functional theory (TD-DFT) based on standard gradient corrected functionals affords both a quantitative and qualitative incorrect picture of charge transfer transitions between two spatially separated regions. It is shown here that the well known failure can be traced back to the use of linear response theory. Further, it is demonstrated that the inclusion of higher order terms readily affords a qualitatively correct picture even for simple functionals based on the local density approximation. The inclusion of these terms is done within the framework of a newly developed variational approach to excitation energies called constrained variational density functional theory (CV-DFT). To second order [CV(2)-DFT] this theory is identical to adiabatic TD-DFT within the Tamm–Dancoff approximation. With inclusion of fourth order corrections [CV(4)-DFT] it affords a qualitative correct description of charge transfer transitions. It is finally demonstrated that the relaxation of the ground state Kohn–Sham orbitals to first order in response to the change in density on excitation together with CV(4)-DFT affords charge transfer excitations in good agreement with experiment. The new relaxed theory is termed R-CV(4)-DFT. The relaxed scheme represents an effective way in which to introduce double replacements into the description of single electron excitations, something that would otherwise require a frequency dependent kernel." @default.
• W2095505877 created "2016-06-24" @default.
• W2095505877 creator A5038188328 @default.
• W2095505877 creator A5053576675 @default.
• W2095505877 date "2010-08-18" @default.
• W2095505877 modified "2023-10-16" @default.
• W2095505877 title "On the calculation of charge transfer transitions with standard density functionals using constrained variational density functional theory" @default.
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• W2095505877 doi "https://doi.org/10.1063/1.3471449" @default.
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