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Influence of Triplet Instabilities in TDDFT

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Peach, Michael J. G., Williamson, Matthew J., Tozer, David J.·2011·Journal of Chemical Theory and Computation

Abstract

Singlet and triplet vertical excitation energies from time-dependent density functional theory (TDDFT) can be affected in different ways by the inclusion of exact exchange in hybrid or Coulomb-attenuated/range-separated exchange-correlation functionals; in particular, triplet excitation energies can become significantly too low. To investigate these issues, the explicit dependence of excitation energies on exact exchange is quantified for four representative molecules, paying attention to the effect of constant, short-range, and long-range contributions. A stability analysis is used to verify that the problematic TDDFT triplet excitations can be understood in terms of the ground state triplet instability problem, and it is proposed that a Hartree-Fock stability analysis should be used to identify triplet excitations for which the presence of exact exchange in the TDDFT functional is undesirable. The use of the Tamm-Dancoff approximation (TDA) significantly improves the problematic triplet excitation energies, recovering the correct state ordering in benzoquinone; it also affects the corresponding singlet states, recovering the correct state ordering in naphthalene. The impressive performance of the TDA is maintained for a wide range of molecules across representative functionals.

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Metadata

Authors
Peach, M. J. G., Williamson, M. J., & Tozer, D. J.
Venue
Journal of Chemical Theory and Computation
Published
2011-10-19
Volume
7
Issue
11
Pages
3578-3585
ISSN
  • 1549-9618 (ISSN-L)
  • 1549-9626
OpenAlex
W2076757103
Cited by
384
References
60
FWCI
7.47
Type
journal article
Language
en
Open access
green

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