Simple position and orientation preconditioning scheme for minimum energy path calculations.

Area of Science:

• Computational Chemistry
• Chemical Reaction Dynamics

Background:

• Minimum-energy path (MEP) calculations, like the nudged elastic band method, require precise initial reactant and product molecular configurations.
• Manual configuration setup for multi-molecule reactions is labor-intensive and relies on expert knowledge to avoid alternative reaction paths and excessive iterations.

Purpose of the Study:

• To introduce an automated, deterministic computational scheme to replace manual initialization of molecular configurations for MEP calculations.
• To develop a method that minimizes steric hindrance and structural differences between reactants and products in initial configurations.

Main Methods:

• A novel preconditioning scheme is presented for automated generation of initial reactant and product configurations.
• The method focuses on minimizing steric hindrance and structural dissimilarities between molecular configurations.

Main Results:

• The automated scheme successfully generates initial configurations for MEP calculations.
• Performance was validated on a benchmark set of over 3400 organic molecular reactions.
• Generated configurations demonstrated strong agreement with manually prepared, ad hoc configurations.

Conclusions:

• The developed computational scheme effectively automates the initialization process for MEP calculations.
• This approach reduces reliance on expert human intervention, saving time and effort.
• The method ensures reliable starting points for accurate reaction path calculations.