Practical guide to replica exchange transition interface sampling and forward flux sampling.

Area of Science:

• Computational Chemistry
• Molecular Dynamics
• Statistical Mechanics

Background:

• Rare events in molecular systems involve transitions between metastable states, often separated by significant free energy barriers.
• Path sampling techniques are crucial for exploring these rare events and their underlying mechanisms.
• Applying these methods to complex molecular systems presents practical challenges.

Purpose of the Study:

• To discuss analysis tools for assessing the quality and convergence of path sampling simulations.
• To provide a general guide for critically evaluating replica exchange transition interface sampling (RETIS) and forward flux sampling (FFS) simulations.
• To exemplify step-wise evaluation using nucleation studies in systems of varying complexity.

Main Methods:

• Focus on replica exchange transition interface sampling (RETIS) and forward flux sampling (FFS) methodologies.
• Development and discussion of a range of analysis tools for simulation assessment.
• Application of evaluation techniques to nucleation phenomena in diverse systems.

Main Results:

• Identification of key analysis tools essential for reliable path sampling simulations.
• Demonstration of step-wise evaluation procedures for assessing simulation quality.
• Validation of assessment methods through studies of nucleation in complex systems.

Conclusions:

• Robust assessment of simulation quality and convergence is critical for accurate rare event studies.
• The presented analysis tools and evaluation guide enhance the reliability of RETIS and FFS simulations.
• This work facilitates a more critical and reliable application of path sampling methods in molecular science.