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Evaluating data for atmospheric models, an example: IO + NO2 = IONO2.

David M Golden¹

¹Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA. david.golden@stanford.edu

The Journal of Physical Chemistry. A

|March 3, 2006

Summary

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This study reconciles bond dissociation energy data for IO-NO2 using computational methods. A revised estimate of approximately 150 kJ mol(-1) is suggested, improving atmospheric chemistry models.

Area of Science:

Chemical Kinetics
Atmospheric Chemistry

Background:

Existing bond dissociation energy (D0) values for IO-NO2 range from 95-135 kJ mol(-1) with significant uncertainty.
Data evaluation panels (NASA, IUPAC) utilize different formalisms for analyzing reaction kinetics.

Purpose of the Study:

To reconcile disparate experimental data for the IO-NO2 bond dissociation energy.
To refine the D0(IO-NO2) value for improved accuracy in atmospheric and engineering models.
To assess the consistency of data evaluation methods with theoretical chemical kinetics.

Main Methods:

Fitting experimental kinetic data to established theoretical formalisms.
Employing Master Equation/RRKM (Rice-Ramsperger-Kassel-Marcus) methods for theoretical calculations.
Investigating the impact of anharmonicity and energy transfer parameters on calculated values.

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Main Results:

Experimental data are well-represented by both NASA and IUPAC formalisms.
Master Equation/RRKM methods suggest a revised D0(IO-NO2) around 150 kJ mol(-1).
Uncertainties in anharmonicity and collision parameters may lower the estimated value by up to 10 kJ mol(-1).

Conclusions:

A more consistent value for D0(IO-NO2) can be determined using theoretical methods.
The refined D0(IO-NO2) value supports the accurate modeling of pressure-dependent rate coefficients in atmospheric and engineering applications.
Despite theoretical advancements, precise determination of specific kinetic details remains challenging due to inherent uncertainties.