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Title: Coupled wave-packets for non-adiabatic molecular dynamics: a generalization of Gaussian wave-packet dynamics to multiple potential energy surfaces

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/C6SC01319H· OSTI ID:1338745
 [1];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division, Center for Nonlinear Studies
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division, Center for Nonlinear Studies and Center for Integrated Nanotechnologies
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division

Accurate simulation of the non-adiabatic dynamics of molecules in excited electronic states is key to understanding molecular photo-physical processes. Here we present a novel method, based on a semiclassical approximation, that is as efficient as the commonly used mean field Ehrenfest or ad hoc surface hopping methods and properly accounts for interference and decoherence effects. This novel method is an extension of Heller's thawed Gaussian wave-packet dynamics that includes coupling between potential energy surfaces. By studying several standard test problems we demonstrate that the accuracy of the method can be systematically improved while maintaining high efficiency. The method is suitable for investigating the role of quantum coherence in the non-adiabatic dynamics of many-atom molecules.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1338745
Report Number(s):
LA-UR-16-20319
Journal Information:
Chemical Science, Vol. 7, Issue 8; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (4)

Coherent exciton-vibrational dynamics and energy transfer in conjugated organics journal June 2018
The best of both Reps—Diabatized Gaussians on adiabatic surfaces journal November 2016
On-the-fly ab initio semiclassical evaluation of time-resolved electronic spectra journal December 2018
On-the-fly ab initio semiclassical evaluation of time-resolved electronic spectra text January 2018

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