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Title: Kinetically-constrained ring-polymer molecular dynamics for non-adiabatic chemistries involving solvent and donor–acceptor dynamical effects

Journal Article · · Faraday Discussions
DOI:https://doi.org/10.1039/c6fd00143b· OSTI ID:1491825
 [1];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)

We investigate the performance of the recently developed kinetically-constrained ring polymer molecular dynamics (KC-RPMD) method for the description of model condensed-phase electron transfer (ET) reactions in which solvent and donor–acceptor dynamics play an important role. Comparison of KC-RPMD with results from Golden-Rule rate theories and numerically exact quantum dynamics calculations demonstrates that KC-RPMD accurately captures the combination of electronic- and nuclear-dynamical effects throughout the Marcus (intermediate solvent friction) and Zusman (large solvent friction) regimes of ET. It is also demonstrated that KC-RPMD accurately describes systems in which the magnitude of the diabatic coupling depends on the position of a dynamical donor–acceptor mode. In addition to these successes, however, we present an unsurprising failure of KC-RPMD to capture the enhancement of the ET rate in the low solvent friction regime associated with nuclear coherence effects. In this analysis, we re-visit several aspects of the original KC-RPMD formulation, including the form of the kinetic constraint and the choice of the mass of the auxiliary electronic variable. In particular, we introduce a Langevin bath for the auxiliary electronic variable to correct for its unphysically low coupling with the nuclear degrees of freedom. This work demonstrates that the KC-RPMD method is well suited for the direct simulation of non-adiabatic donor–acceptor chemistries associated with many complex systems, including those for which solvent dynamics plays an important role in the reaction mechanism.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1491825
Journal Information:
Faraday Discussions, Vol. 195; ISSN 1359-6640
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (16)

Nuclear quantum effects enter the mainstream journal February 2018
Analytic continuation of Wolynes theory into the Marcus inverted regime journal March 2018
Path-integral isomorphic Hamiltonian for including nuclear quantum effects in non-adiabatic dynamics journal March 2018
Nonadiabatic quantum transition-state theory in the golden-rule limit. I. Theory and application to model systems journal March 2019
On the calculation of quantum mechanical electron transfer rates journal September 2019
Nonadiabatic quantum transition-state theory in the golden-rule limit. II. Overcoming the pitfalls of the saddle-point and semiclassical approximations journal December 2019
Instanton formulation of Fermi’s golden rule in the Marcus inverted regime journal January 2020
Fluctuating hydrogen-bond networks govern anomalous electron transfer kinetics in a blue copper protein journal May 2018
Nonadiabatic quantum transition-state theory in the golden-rule limit. I. Theory and application to model systems text January 2019
Nonadiabatic quantum transition-state theory in the golden-rule limit: II. Overcoming the pitfalls of the saddle-pointand semiclassical approximations text January 2019
Instanton formulation of Fermi’s golden rule in the Marcus inverted regime text January 2020
Analytic continuation of Wolynes theory into the Marcus inverted regime text January 2017
Non-adiabatic dynamics of electrons and atoms under non-equilibrium conditions text January 2018
Nonadiabatic quantum transition-state theory in the golden-rule limit. I. Theory and application to model systems text January 2018
Nonadiabatic quantum transition-state theory in the golden-rule limit. II. Overcoming the pitfalls of the saddle-point and semiclassical approximations text January 2019
Instanton formulation of Fermi's golden rule in the Marcus inverted regime text January 2019

Figures / Tables (5)