Many-Body Effects in Aqueous Systems: Synergies Between Interaction Analysis Techniques and Force Field Development

Area of Science:

• Computational Chemistry
• Theoretical Chemistry
• Molecular Modeling

Background:

• Molecular interactions are fundamental to chemistry and biology.
• Traditional methods often rely on pairwise additive models, neglecting complex many-body effects.
• Understanding nonadditive interactions is key to accurate molecular simulations.

Purpose of the Study:

• To review interaction analysis techniques for understanding molecular interactions.
• To explore the synergy between these techniques and advanced force field development.
• To highlight the application of many-body expansion in ab initio molecular dynamics.

Main Methods:

• Review of many-body expansion (MBE), symmetry-adapted perturbation theory, and energy decomposition analysis.
• Discussion of historical context and emergence of nonadditivities.
• Focus on ab initio-based force fields incorporating many-body terms.

Main Results:

• Interaction analysis provides intuitive understanding of complex molecular systems.
• Synergy exists between interaction analysis and advanced force field development.
• Many-body effects are incorporated into force fields via distributed multipoles, MBE fitting, neural networks, or coarse-graining.

Conclusions:

• Interaction analysis techniques are vital for accurate molecular modeling.
• Ab initio-based force fields increasingly incorporate many-body effects.
• Many-body expansion shows promise for enhancing ab initio molecular dynamics.