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NEXMD v2.0 Software Package for Nonadiabatic Excited State Molecular Dynamics Simulations.

Victor M Freixas1, Walter Malone2, Xinyang Li3

  • 1Departments of Chemistry and Physics and Astronomy, University of California, Irvine, California 92697-2025, United States.

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Summary

NEXMD v2.0 introduces new quantum-classical dynamics methods, Ehrenfest dynamics (EHR) and Ab-Initio Multiple Cloning (AIMC), enhancing molecular simulations. These methods, alongside trajectory surface hopping (TSH), offer deeper insights into photodynamics and vibronic couplings.

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Area of Science:

  • Computational Chemistry
  • Quantum Dynamics
  • Molecular Modeling

Background:

  • Accurate simulation of excited-state molecular dynamics is crucial for understanding photophysical processes.
  • Existing methods like trajectory surface hopping (TSH) have limitations in capturing complex quantum effects.

Purpose of the Study:

  • Introduce NEXMD version 2.0, featuring new hybrid quantum-classical dynamics methods.
  • Compare the strengths and weaknesses of Ehrenfest dynamics (EHR), Ab-Initio Multiple Cloning (AIMC), and TSH within the NEXMD framework.
  • Enhance the analysis of vibronic dynamics and quantum coherences in molecular systems.

Main Methods:

  • Implementation of Ehrenfest dynamics (EHR) and Ab-Initio Multiple Cloning (AIMC) in NEXMD v2.0.
  • Direct comparison of EHR, AIMC, and TSH using modeled photodynamics of a polyphenylene ethylene dendrimer.
  • Expanded normal-mode analysis and constraints for ground and excited states.

Main Results:

  • NEXMD v2.0 offers alternative hybrid quantum-classical dynamics methods (EHR, AIMC) to TSH.
  • Comparative analysis highlights the strengths and weaknesses of each method for specific photodynamic scenarios.
  • New analysis tools enable deeper investigation of vibrational motions and vibronic dynamics.

Conclusions:

  • NEXMD v2.0 significantly expands the applicability of nonadiabatic excited-state molecular dynamics simulations.
  • The software now better handles multichromophore organic molecules and complex photophysical processes.
  • Improved methods facilitate the study of quantum coherences and state couplings in excited molecules.