Assessment of time-dependent density functional theory with the restricted excitation space approximation for excited state calculations of large systems

Magnus W.D. Hanson-Heine, Michael W. George, Nicholas A. Besley

Research output: Journal PublicationArticlepeer-review

10 Citations (Scopus)

Abstract

The restricted excitation subspace approximation is explored as a basis to reduce the memory storage required in linear response time-dependent density functional theory (TDDFT) calculations within the Tamm–Dancoff approximation. It is shown that excluding the core orbitals and up to 70% of the virtual orbitals in the construction of the excitation subspace does not result in significant changes in computed UV/vis spectra for large molecules. The reduced size of the excitation subspace greatly reduces the size of the subspace vectors that need to be stored when using the Davidson procedure to determine the eigenvalues of the TDDFT equations. Furthermore, additional screening of the two-electron integrals in combination with a reduction in the size of the numerical integration grid used in the TDDFT calculation leads to significant computational savings. The use of these approximations represents a simple approach to extend TDDFT to the study of large systems and make the calculations increasingly tractable using modest computing resources.

Original languageEnglish
Pages (from-to)1452-1459
Number of pages8
JournalMolecular Physics
Volume116
Issue number11
DOIs
Publication statusPublished - 3 Jun 2018

Keywords

  • TDDFT
  • large systems
  • restricted subspace approximation

ASJC Scopus subject areas

  • Biophysics
  • Molecular Biology
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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