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Optimal initial condition sampling for multi-configurational Ehrenfest dynamics.

Thies Romig1, Francesco Montorsi2, Francesco Segatta2

  • 1Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23-24, 18059 Rostock, Germany.

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Summary
This summary is machine-generated.

The multi-configurational Ehrenfest (MCE) method simulates quantum dynamics using trajectories. A cubic grid strategy for initial conditions proves universally effective for non-adiabatic transitions.

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Area of Science:

  • Computational Chemistry
  • Quantum Dynamics
  • Attosecond Science

Background:

  • Exact quantum dynamics simulations are computationally expensive for complex systems.
  • Non-adiabatic transitions are crucial in many chemical and physical processes.
  • The multi-configurational Ehrenfest (MCE) method offers a hybrid quantum-semiclassical approach.

Purpose of the Study:

  • To evaluate strategies for generating initial trajectory conditions in MCE.
  • To identify optimal initial conditions for accurate non-adiabatic dynamics simulations.
  • To assess MCE's applicability to systems with multiple conical intersections and broadband excitation.

Main Methods:

  • Systematic evaluation of physical (Wigner, compressed Wigner) and geometric (spherical, cubic grids) initial condition generation strategies.
  • Analysis of trajectory cloning for improving performance in systems with multiple conical intersections.
  • Assessment of MCE's suitability for simulating systems with many coupled electronic states.

Main Results:

  • A cubic grid with unit spacing in dimensionless coordinates is identified as a near-universal and system-independent initial condition strategy.
  • Trajectory cloning enhances MCE performance in systems with multiple conical intersections, contingent on basis convergence.
  • MCE demonstrates particular advantage for simulating broadband excitation processes in attosecond science.

Conclusions:

  • The cubic grid strategy significantly improves the efficiency and accuracy of MCE simulations.
  • MCE is a flexible and advantageous method for simulating non-adiabatic dynamics, especially in systems with numerous coupled electronic states.
  • MCE's parallel implementation flexibility makes it highly relevant for advanced attosecond science applications.