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Chemistry

Size Effects in the Strong-Field Ionization and Dissociation Dynamics of (HO) (n=1-4)

Chen Jiang, Cody L. Covington, Kalman Varga

Featured July 2, 2026

Original Paper

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Simply

Tiny water clusters react very differently to strong laser light depending on their size, with larger clusters showing much faster and more complex proton movements even though they don't lose many more electrons.

In depth
This study reveals that the strong-field response of water clusters, including proton ejection and proton transfer, is dramatically reshaped by the hydrogen-bond network topology and multi-center Coulomb interactions, rather than by changes in net ionization alone. The transition from dimer to trimer is identified as a critical point where these dynamics become significantly amplified and concentrated in time, shifting from slow, post-pulse events to rapid, pulse-concurrent processes.

Key Takeaways

  • 1
    The net ionization per monomer is largely insensitive to cluster size, varying by less than 8% across monomer to tetramer.
  • 2
    H-ejection and H-transfer activities increase dramatically with cluster size, especially from dimer to trimer, and become strongly concentrated within the laser pulse window for larger clusters.
  • 3
    The RT-TDDFT/Ehrenfest framework successfully models coupled electron-nuclear dynamics under strong laser fields, providing insights into size-dependent fragmentation pathways and protonic rearrangements.

Conceptual Flow

HIGH LEVEL
1
Methodology: Simulating Laser-Driven Molecules

The scientists used a special computer program to watch how electrons and atoms move together when hit by a laser, without needing to guess how they'd react beforehand.

Water Cluster
Laser Pulse
Simulate Electron & Atom Dance
Electron Movement
Atom Movement
2
Results: Size Changes How Water Breaks Apart

They found that bigger water clusters break apart and swap hydrogen atoms much more easily and quickly than smaller ones, even if they lose the same number of electrons.

Small Water Cluster
Big Water Cluster
Hit with Laser
Slow, Simple Breakup
Fast, Complex Breakup