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• W3102163014 abstract "Multiple time-scale algorithms exploit the natural separation of time-scales in chemical systems to greatly accelerate the efficiency of molecular dynamics simulations. Although the utility of these methods in systems where the interactions are described by empirical potentials is now well established, their application to ab initio molecular dynamics calculations has been limited by difficulties associated with splitting the ab initio potential into fast and slowly varying components. Here we show that such a timescale separation is possible using two different schemes: one based on fragment decomposition and the other on range separation of the Coulomb operator in the electronic Hamiltonian. We demonstrate for both water clusters and a solvated hydroxide ion that multiple time-scale molecular dynamics allows for outer time steps of 2.5 fs, which are as large as those obtained when such schemes are applied to empirical potentials, while still allowing for bonds to be broken and reformed throughout the dynamics. This permits computational speedups of up to 4.4x, compared to standard Born-Oppenheimer ab initio molecular dynamics with a 0.5 fs time step, while maintaining the same energy conservation and accuracy." @default.
• W3102163014 created "2020-11-23" @default.
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• W3102163014 date "2014-02-28" @default.
• W3102163014 modified "2023-09-23" @default.
• W3102163014 title "Multiple time step integrators in <i>ab initio</i> molecular dynamics" @default.
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• W3102163014 doi "https://doi.org/10.1063/1.4866176" @default.
• W3102163014 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24588157" @default.
• W3102163014 hasPublicationYear "2014" @default.
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