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Investigating electron attachment to nitric oxide reveals two resonance features in the O(-) channel. These findings clarify dissociation pathways, suggesting indirect mechanisms are responsible for observed outcomes.

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Area of Science:

  • Physical Chemistry
  • Atomic and Molecular Physics
  • Chemical Physics

Background:

  • Dissociative electron attachment (DEA) is a fundamental process in molecular physics.
  • Nitric oxide (NO) is a key molecule in atmospheric and combustion chemistry.
  • Previous studies on NO DEA have yielded controversial results regarding dissociation pathways.

Purpose of the Study:

  • To experimentally and theoretically investigate the DEA process in nitric oxide.
  • To identify and characterize resonance features in the O(-) channel.
  • To resolve controversies surrounding the dissociation limits of NO DEA.

Main Methods:

  • Experimental measurements using ion momentum imaging.
  • Theoretical calculations employing R-matrix theory.
  • Analysis of angular distributions of O(-) ions.

Main Results:

  • Two distinct resonance features were observed in the O(-) channel.
  • These resonances correspond to the dissociation of NO into N atoms in (2)D and (2)P excited states.
  • Experimental angular distributions suggest Π symmetry for one resonance and a mix of Π, Σ, or Δ symmetry for the other.
  • R-matrix calculations indicated no direct DEA pathway to O(-) via these resonances; instead, decay occurred to O + N(-) or O(-) + N((4)S).

Conclusions:

  • The study definitively identifies the dissociation limits for specific resonance features in NO DEA.
  • Discrepancies between experimental observations and direct theoretical calculations suggest indirect mechanisms.
  • Proposed indirect mechanisms involving curve crossings are likely responsible for the observed O(-) production.