Theoretically grounded approaches to account for polarization effects in fixed-charge force fields

Area of Science:

• Computational Chemistry
• Molecular Modeling
• Physical Chemistry

Background:

• Non-polarizable (fixed-charge) force fields are widely used in molecular simulations.
• These models implicitly account for polarization effects, often through empirical methods.
• Accurate description of the potential energy surface (PES) is crucial for simulation reliability.

Purpose of the Study:

• To review recent theoretical advancements in modeling polarization effects for fixed-charge force fields.
• To present a unified approach for developing non-polarizable models with optimized parameters.
• To demonstrate the application of these theories for improved PES descriptions.

Main Methods:

• Description of "halfway-charge" theory and molecular dynamics in electronic continuum theory.
• Reconciliation of these theories into a unified force field development workflow.
• Application of the unified approach to construct optimized non-polarizable models.

Main Results:

• Both "halfway-charge" and molecular dynamics in electronic continuum theory yield similar predictions for polarization.
• The unified approach enables the development of non-polarizable force fields with optimal charge/dipole values.
• Optimized models provide a more accurate description of the potential energy surface (PES).

Conclusions:

• Recent theoretical treatments offer a rigorous framework for improving fixed-charge force fields.
• A unified approach allows for the construction of non-polarizable models that better represent system polarization.
• This work provides a pathway for developing more accurate and reliable molecular simulations.