Accurate Classical Polarization Solution with No Self-Consistent Field Iterations.

Area of Science:

• Computational Chemistry
• Molecular Dynamics
• Quantum Chemistry

Background:

• Classical polarization calculations are computationally expensive due to the need for self-consistent field (SCF) iterations.
• Existing methods often require time-reversible initial guesses for SCF solutions, adding complexity.
• Accurate molecular simulations are crucial for understanding chemical and biological processes.

Purpose of the Study:

• To introduce a novel, computationally efficient method for classical polarization that eliminates the need for SCF iterations.
• To demonstrate that the new method maintains simulation accuracy across diverse chemical environments.
• To provide a faster alternative to traditional SCF-based polarization calculations.

Main Methods:

• Development of the iEL/0-SCF approach, building upon the iEL/SCF Lagrangian scheme.
• Utilizing auxiliary induced dipoles to drive the time evolution of real induced dipoles.
• Ensuring the system remains close to the Born-Oppenheimer surface for an SCF-less calculation.

Main Results:

• The iEL/0-SCF method achieves SCF-less classical polarization without loss of accuracy.
• Simulations across bulk water, salt solutions, and systems with solutes/proteins show comparable accuracy to SCF methods.
• Significant computational savings are achieved compared to traditional SCF calculations.

Conclusions:

• The iEL/0-SCF method provides a computationally efficient and accurate solution for classical polarization.
• This approach accelerates molecular simulations, particularly for complex systems.
• The method is as fast as existing reversible reference system propagator algorithms.