Abstract
Bond-breaking excitations ω α are the problematic case of adiabatic time-dependent density functional theory (TDDFT). The calculated ω α erroneously vanishes with the bond elongation, since the Hartree-exchange-correlation kernel and the corresponding response coupling matrix K of standard approximations lack the characteristic divergence in the dissociation limit. In this paper an approximation for K is proposed constructed from the highest-level functionals, in which both occupied and virtual Kohn-Sham orbitals participate with the weights w p . The latter provide the correct divergence of K in the limit of dissociating two-electron bond. The present K brings a decisive contribution to the energy of the 1Σ u + in the prototype H2 molecule calculated for various H-H separations. At shorter separations it improves ω α compared to the zero-order TDDFT estimate, while at the largest separation it reproduces near-saturation of the reference excitation energy.
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Contribution to the Topical Issue “Special issue in honor of Hardy Gross”, edited by C.A. Ullrich, F.M.S. Nogueira, A. Rubio, and M.A.L. Marques.
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van Meer, R., Gritsenko, O.V. Bond-breaking excitations with diverging coupling matrix of response density functional theory from highest-level functionals. Eur. Phys. J. B 91, 122 (2018). https://doi.org/10.1140/epjb/e2018-90088-6
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DOI: https://doi.org/10.1140/epjb/e2018-90088-6