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Photodissociation Dynamics in (N2)n+ Clusters.

John R C Blais1, B Wade Stratton1, Nathan J Dynak1

  • 1Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States.

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|September 25, 2025
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Summary
This summary is machine-generated.

Nitrogen cluster ions (N₂)n⁺ were studied using UV laser photodissociation. Results show the tetranitrogen ion (N₄⁺) acts as the chromophore, residing on the cluster surface rather than being fully caged.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Molecular Dynamics

Background:

  • Nitrogen cluster ions (N₂)n⁺ are crucial in various chemical processes.
  • Understanding their structure and photodissociation dynamics is key to controlling reactions.

Purpose of the Study:

  • To investigate the photodissociation of nitrogen cluster ions (N₂)n⁺.
  • To determine the role of the tetranitrogen ion (N₄⁺) as a chromophore.
  • To elucidate the structural dynamics and surface interactions within these clusters.

Main Methods:

  • Production and cooling of (N₂)n⁺ cluster ions via pulsed-discharge supersonic expansion.
  • UV laser photodissociation at 355 nm.
  • Velocity-map imaging (VMI) for fragment analysis.

Main Results:

  • All cluster sizes up to n=15 showed strong absorption near 355 nm.
  • Clusters with n>3 dissociated into N₂⁺ and N₄⁺ fragments.
  • N₄⁺ was identified as the chromophore, with its kinetic energy release indicating a surface-bound state.

Conclusions:

  • The N₄⁺ ion acts as the primary light-absorbing unit in larger nitrogen clusters.
  • N₄⁺ is located near the surface, not fully caged by surrounding N₂ molecules.
  • Photodissociation and recombination processes are surface-mediated, not governed by complete caging.