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Related Experiment Video

Updated: Jul 14, 2026

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

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The reaction Cl+NO2-->ClONO and ClNO2.

David M Golden¹

¹Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA.

The Journal of Physical Chemistry. A

|June 6, 2007

Summary

This study examines Cl + NO2 reaction data, finding that current models underpredict rates by 2.6. Adjusting rotational activity or collision frequency improves predictions for this key atmospheric reaction.

Area of Science:

Chemical Kinetics
Atmospheric Chemistry
Computational Chemistry

Background:

Existing experimental data for the Cl + NO2 reaction has been analyzed.
This reaction is significant in atmospheric chemistry.
Previous theoretical models showed discrepancies with experimental results.

Purpose of the Study:

To compare experimental data for Cl + NO2 with theoretical calculations.
To identify the reasons for underprediction of reaction rates by existing models.
To refine theoretical approaches for accurate kinetic predictions.

Main Methods:

Utilized the "Multiwell" software suite for RRKM/Master Equation (ME) calculations.
Incorporated ab initio quantum mechanical calculations from the literature.

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Analyzed sensitivity to density of states, collisional energy transfer, centrifugal effects, and anharmonicity.

Main Results:

Experimental data were underpredicted by a factor of 2.6 using standard theoretical prescriptions.
The discrepancy was attributed to factors like rotational degrees of freedom, collision frequency, and anharmonicity.
Adjusting these parameters, such as activating all rotational modes or increasing collision frequency, improved model accuracy.

Conclusions:

Standard theoretical methods require adjustments to accurately model the Cl + NO2 reaction at low pressures.
Accurate modeling necessitates careful consideration of molecular properties like anharmonicity and collisional energy transfer.
Refined theoretical approaches are crucial for understanding atmospheric reaction mechanisms.