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Chemistry

On transition path times for condensed-phase non-adiabatic electron transfer reactions under a two-parabola model

Ryo Nihei, Hiroki Uratani, Hirofumi Sato

Featured August 4, 2026

Original Paper

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Simply

Using computer simulations, the paper shows that tiny electron jumps in chemical reactions, called transition path times, are not always super-fast as thought, and their speed is controlled differently than the overall reaction speed.

In depth
The paper introduces a simulation framework combining Langevin dynamics with Zhu-Nakamura theory to study non-adiabatic electron transfer reactions. This approach allows for a detailed analysis of the transition path time (TPT), revealing that microscopic transition events are not always instantaneous compared to the macroscopic reaction time, especially under strong diabatic coupling. The study further demonstrates that the mean TPT is primarily controlled by solvent friction, while the overall reaction rate is governed by diabatic coupling.

Key Takeaways

  • 1
    The paper provides a unified simulation approach for non-adiabatic electron transfer, integrating nuclear dynamics and electronic transitions.
  • 2
    It challenges the assumption of instantaneous microscopic transitions, showing that TPT can be a significant fraction of the macroscopic reaction time.
  • 3
    The study reveals that friction parameter $\gamma$ primarily controls mean TPT, while diabatic coupling $V$ governs the macroscopic reaction rate.

Conceptual Flow

HIGH LEVEL
1
Simulating Electron Jumps

Scientists used a special computer program to watch how electrons jump between different energy levels, like a ball rolling over hills, but with tiny quantum jumps.

Start State
End State
Solvent Wiggle
Simulate Jumps
Electron Path
Jump Time
2
Jumps Take Time

They found that these tiny electron jumps can take a noticeable amount of time, not always instantly, and this time is affected by how sticky the liquid is and how strongly the electron wants to jump.

Fast Jumps (Old Idea)
Slow Jumps (New Finding)
Compare Speeds
Micro Jumps
Overall Reaction