Journal
CHEMICAL PHYSICS
Volume 460, Issue -, Pages 117-124Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2015.06.007
Keywords
Time-derivative coupling; Nonadiabatic coupling matrix element; Nonadiabatic molecular dynamics; Ab initio multiple spawning; Conical intersection; Trivial unavoided crossing
Funding
- Michigan State University
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Recently we introduced a norm-preserving wavefunction interpolation (NPI) method which allows the accurate and efficient integration of the time-dependent Schrodinger equation in regions of rapidly varying time-derivative coupling (TDC), e.g. near conical intersections (CIs) and effectively (N-1)-dimensional trivial unavoided crossings (TUCs). Herein we report the implementation of the NPI scheme into the ab initio multiple spawning (AIMS) method and investigate its behavior in two test systems: one which exhibits a CI and another which exhibits a TUC. In the CI case, AIMS-NPI predicts transfer probabilities that agree to within 0.6% of simulations based on the analytical evaluation of the nonadiabatic couplings, without the need for computationally expensive adaptive integration. In the TUC case, AIMS-NPI results in less than 0.08% error in the population transfer probability when a 0.12 fs time step is used, while simulations based on the analytical approach exhibit catastrophic errors for all finite time steps. (C) 2015 Elsevier B.V. All rights reserved.
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