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Download fileStrong influence of decoherence corrections and momentum rescaling in surface hopping dynamics of transition metal complexes
journal contribution
posted on 2019-08-05, 12:47 authored by Felix PlasserFelix Plasser, Sebastian Mai, Maria Fumanal, Etienne Gindensperger, Chantal Daniel, Leticia GonzalezThe reliability of different parameters in the surface hopping method is assessed for a vibronic coupling model of a challenging transition metal complex, where a large number of electronic states of different multiplicities are met within a small energy range. In particular, the effect of two decoherence correction schemes and of various strategies for momentum rescaling and treating frustrating hops during the dynamics is investigated and compared against an accurate quantum dynamics simulation. The results show that surface hopping is generally able to reproduce the reference but also that small differences in the protocol used can strongly affect the results. We find a clear preference for momentum rescaling along only one degree of freedom, using either the nonadiabatic coupling or the gradient difference vector, and trace this effect back to an enhanced number of frustrated hops. Furthermore, reflection of the momentum after frustrated hops is shown to work better than to ignore the process completely. The study also highlights the importance of the decoherence correction but neither of the two methods employed, energy based decoherence or augmented fewest switches surface hopping, performs completely satisfactory and we trace this effect back to a lack of size-consistency. Finally, the effect of different methods for analysing the populations is highlighted. More generally, the study emphasises the importance of the often neglected parameters in surface hopping and shows that there is still need for simple, robust, and generally applicable correction schemes.
Funding
Austrian Science Fund – Austria (FWF) within project I2883 (DeNeTheor)
Labex CSC (ANR-10-LABX- 0026_CSC) and the French/Austrian ANR-15-CE29-0027- 01 (DeNeTheor)
History
School
- Science
Department
- Chemistry
Published in
Journal of Chemical Theory and ComputationVolume
15Issue
9Pages
5031 - 5045Publisher
American Chemical SocietyVersion
- AM (Accepted Manuscript)
Rights holder
© American Chemical SocietyPublisher statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Chemical Theory and Computation, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.jctc.9b00525.Publication date
2019-07-24Copyright date
2019ISSN
1549-9618eISSN
1549-9626Language
- en