A comment to the nudged elastic band method.

Area of Science:

• Theoretical Chemistry
• Computational Chemistry
• Chemical Reaction Dynamics

Background:

• The minimum energy path (MEP) is crucial for understanding chemical reactions.
• The nudged elastic band (NEB) method is widely used to calculate MEPs.
• Previous assumptions held that NEB exclusively yields steepest descent pathways.

Discussion:

• This comment critically examines the NEB method's output.
• We demonstrate that NEB, when used without spring forces, can converge to a gradient extremal.
• This contrasts with the commonly held belief that NEB always finds a steepest descent path.

Key Insights:

• The NEB method's convergence is not limited to steepest descent pathways.
• Removing spring forces from the NEB algorithm allows for the identification of gradient extremals.
• This highlights a critical nuance in applying NEB for MEP determination.

Outlook:

• Re-evaluation of NEB results in theoretical chemistry is warranted.
• Further studies could explore the implications of gradient extremal pathways.
• Refined computational strategies may emerge from understanding NEB's full capabilities.