Improved DFT Potential Energy Surfaces via Improved Densities

Min Cheol Kim, Hansol Park, Suyeon Son, Eunji Sim, Kieron Burke

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Density-corrected DFT is a method that cures several failures of self-consistent semilocal DFT calculations by using a more accurate density instead. A novel procedure employs the Hartree-Fock density to bonds that are more severely stretched than ever before. This substantially increases the range of accurate potential energy surfaces obtainable from semilocal DFT for many heteronuclear molecules. We show that this works for both neutral and charged molecules. We explain why and explore more difficult cases, for example, CH+, where density-corrected DFT results are even better than sophisticated methods like CCSD. We give a simple criterion for when DC-DFT should be more accurate than self-consistent DFT that can be applied for most cases.

Original languageEnglish
Pages (from-to)3802-3807
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume6
Issue number19
DOIs
Publication statusPublished - 2015 Oct 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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