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Related Experiment Video

Updated: Jul 4, 2025

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps

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Mutual Neutralization of NO^{+} with O^{-}.

Mathias Poline¹, Arnaud Dochain¹, Stefan Rosén¹

¹Department of Physics, Stockholm University, Stockholm SE-10691, Sweden.

Physical Review Letters

|January 26, 2024

Summary

The reaction between nitric oxide ions (NO^{+}) and oxygen anions (O^{-}) primarily produces three atomic fragments. This study reveals a two-step mechanism involving a Rydberg state intermediate.

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Area of Science:

Chemical Physics
Atomic and Molecular Collisions

Background:

Mutual neutralization reactions are fundamental in plasma chemistry and astrophysics.
Understanding these reactions provides insights into ion-molecule interactions.

Purpose of the Study:

To investigate the mutual neutralization reaction of NO^{+} with O^{-} at low collision energies.
To elucidate the reaction mechanism and identify the resulting products.

Main Methods:

Experiments were conducted under single-collision conditions with a collision energy of approximately 0.1 eV.
Product-momentum analysis was employed within a simplified theoretical model.

Main Results:

The reaction is dominated by the production of three ground-state atomic fragments.
Analysis suggests a two-step mechanism involving an intermediate Rydberg state of NO.

Conclusions:

The mutual neutralization of NO^{+} and O^{-} proceeds via a two-step pathway.
An intermediate Rydberg state of NO plays a crucial role before fragmentation into atomic products.