Non-adiabatic molecular dynamics by accelerated semiclassical Monte Carlo

Alexander J. White, Vyacheslav N. Gorshkov, Sergei Tretiak, Dmitry Mozyrsky

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Non-adiabatic dynamics, where systems non-radiatively transition between electronic states, plays a crucial role in many photo-physical processes, such as fluorescence, phosphorescence, and photoisomerization. Methods for the simulation of non-adiabatic dynamics are typically either numerically impractical, highly complex, or based on approximations which can result in failure for even simple systems. Recently, the Semiclassical Monte Carlo (SCMC) approach was developed in an attempt to combine the accuracy of rigorous semiclassical methods with the efficiency and simplicity of widely used surface hopping methods. However, while SCMC was found to be more efficient than other semiclassical methods, it is not yet as efficient as is needed to be used for large molecular systems. Here, we have developed two new methods: the accelerated-SCMC and the accelerated-SCMC with re-Gaussianization, which reduce the cost of the SCMC algorithm up to two orders of magnitude for certain systems. In most cases shown here, the new procedures are nearly as efficient as the commonly used surface hopping schemes, with little to no loss of accuracy. This implies that these modified SCMC algorithms will be of practical numerical solutions for simulating non-adiabatic dynamics in realistic molecular systems.

Original languageEnglish
Article number014115
JournalJournal of Chemical Physics
Volume143
Issue number1
DOIs
Publication statusPublished - 7 Jul 2015
Externally publishedYes

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