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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

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Ab Initio Nonadiabatic Quantum Molecular Dynamics.

Basile F E Curchod¹, Todd J Martínez^2,3

¹Department of Chemistry , Durham University , South Road , Durham DH1 3LE , United Kingdom.

Chemical Reviews

|February 22, 2018

Summary

This summary is machine-generated.

This review explores advanced quantum molecular dynamics methods for simulating chemical reactions on excited electronic states. These methods accurately describe molecular behavior beyond the Born-Oppenheimer approximation, crucial for renewable energy and spectroscopy.

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Area of Science:

Quantum Chemistry
Molecular Dynamics
Spectroscopy

Background:

The Born-Oppenheimer approximation is fundamental to chemical simulations but fails for excited electronic states.
Accurate simulation of excited-state dynamics is vital for applications in renewable energy, synthesis, and bioimaging.
Understanding nonadiabatic dynamics is key to interpreting ultrafast spectroscopic experiments.

Purpose of the Study:

To review methods for simulating nonadiabatic molecular dynamics.
To highlight approaches that treat both electronic and nuclear quantum mechanics simultaneously.
To introduce intermediate methods combining quantum and classical dynamics.

Main Methods:

Ab initio quantum molecular dynamics methods solve electronic and nuclear Schrödinger equations concurrently.
Full quantum dynamics methods include the multiconfigurational time-dependent Hartree (MCTDH) method.
Classical trajectory-based methods, like trajectory surface hopping, are also discussed.
A third class of intermediate methods using Gaussian basis set expansions around trajectories is presented.

Main Results:

These advanced methods avoid pre-calculating potential energy surfaces and nonadiabatic coupling elements.
Simultaneous quantum treatment of electrons and nuclei enables accurate excited-state dynamics.
The reviewed methods offer a range of computational costs and accuracy levels.

Conclusions:

Accurate simulation of nonadiabatic dynamics is essential for understanding excited-state chemical processes.
The development of ab initio quantum molecular dynamics methods provides powerful tools for chemical research.
Intermediate methods offer a promising balance between accuracy and computational efficiency for complex systems.