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Updated: Jun 30, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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The associative ionization of N(2P) + O(3P).

Nicholas S Shuman¹, Thomas M Miller², Shaun G Ard¹

¹Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, USA.

The Journal of Chemical Physics

|March 19, 2024

Summary

The associative ionization reaction between nitrogen and oxygen atoms was measured. This reaction, crucial for atmospheric chemistry, proceeds primarily via associative ionization, yielding a rate constant of 8 ± 5 × 10-11 cm3 s-1.

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Area of Science:

Atmospheric Chemistry
Chemical Kinetics
Plasma Physics

Background:

The N(2P) + O(3P) reaction is significant in atmospheric and plasma environments.
Previous measurements of N(2P) + O reaction rates have yielded varying results.
Understanding the reaction mechanism is key to accurate atmospheric modeling.

Purpose of the Study:

To accurately measure the rate constant for the associative ionization reaction N(2P) + O(3P) → NO+ + e-.
To elucidate the dominant reaction pathway for N(2P) + O collisions.
To compare experimental findings with existing literature values.

Main Methods:

Utilized a flow tube apparatus with a flowing afterglow source.
Generated nitrogen atoms (N(2P)) via dissociative recombination of nitrogen ions.
Introduced oxygen atoms and monitored the formation of NO+ ions.

Main Results:

Determined the rate constant for N(2P) + O(3P) → NO+ + e- to be (8 ± 5) × 10-11 cm3 s-1.
Observed NO+ formation exclusively attributed to the title reaction.
The measured rate constant is higher than previously reported disappearance rate constants for N(2P) + O.

Conclusions:

The N(2P) + O(3P) reaction predominantly proceeds via associative ionization.
Quenching to the 2D or 4S states of nitrogen atoms are minor reaction channels.
The findings provide crucial data for atmospheric models and plasma chemistry.