Addressing an instability in unrestricted density functional theory direct dynamics simulations

Shreyas Malpathak, Xinyou Ma, William L. Hase

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

In Density Functional Theory (DFT) direct dynamics simulations with Unrestricted Hartree Fock (UHF) theory, triplet instability often emerges when numerically integrating a classical trajectory. A broken symmetry initial guess for the wave function is often used to obtain the unrestricted DFT potential energy surface (PES), but this is found to be often insufficient for direct dynamics simulations. An algorithm is described for obtaining smooth transitions between the open-shell and the closed-shell regions of the unrestricted PES, and thus stable trajectories, for direct dynamics simulations of dioxetane and its •OCH2-CH2O• singlet diradical.

Original languageEnglish
Pages (from-to)933-936
Number of pages4
JournalJournal of Computational Chemistry
Volume40
Issue number8
DOIs
StatePublished - Mar 30 2019

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