Recent Advances for Improving the Accuracy, Transferability, and Efficiency of Reactive Force Fields

Area of Science:

• Computational Chemistry
• Materials Science
• Chemical Physics

Background:

• Reactive force fields offer a cost-effective alternative to quantum mechanics for simulating chemical reactions.
• Current limitations include challenges in accuracy, transferability, and high computational costs compared to nonreactive methods.

Purpose of the Study:

• To review recent progress in enhancing the performance of reactive force fields, focusing on the ReaxFF model.
• To highlight improvements in accuracy, transferability, and computational efficiency.

Main Methods:

• Reformulation of charge equilibration schemes to prevent unphysical charge transfer.
• Development of ReaxFF models incorporating explicit electrons.
• Application of extended Lagrangian schemes and matrix preconditioners to accelerate computations.
• Integration with LAMMPS for improved software performance.

Main Results:

• Overcoming limitations in charge transfer accuracy and energy conservation in ReaxFF.
• Enabling simulations of charge transfer, redox chemistry, and large systems like reverse micelles.
• Significant acceleration of the charge equilibration method and overall ReaxFF simulations.

Conclusions:

• Recent developments have substantially improved the accuracy, transferability, and computational speed of ReaxFF.
• These advancements broaden the applicability of reactive force fields to complex chemical systems and reactions.