A model for temperature-dependent collisional quenching of OH A(sup 2) Sigma(sup +)

Details A model for temperature-dependent collisional quenching of OH A(sup 2) Sigma(sup +) A model for temperature-dependent collisional quenching of OH A(sup 2) Sigma(sup +)

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jqsrt..51..511p&link_type=abstract

Journal of Quantitative Spectroscopy & Radiative Transfer (ISSN 0022-4073), vol. 51, no. 3, p. 511-524

Physics

Atomic Physics

40

Collisions, Electron Transfer, Hydroxyl Radicals, Mathematical Models, Quenching (Atomic Physics), Temperature Dependence, Aerothermodynamics, Boltzmann Distribution, Electrical Properties, Ionization Potentials, Perturbation

Scientific paper

A model for the temperature-dependent collisional quenching of OH A(sup 2) Sigma(sup +) is presented. The model for quenching is based on a classical electron transfer mechanism. Predictions of the model are shown to adequately reproduce many of the experimentally observed trends: variation with collision partner, temperature, and vibrational level in OH A(sup 2) Sigma(sup +), and the disposition of the quenching products. A negligibly small electronic quenching cross-section is predicted for collision partners having positive ions that cannot be produced through a thermal collision with OH A(sup 2) Sigma(sup +). Results of the model are compared to experimentally measured cross-sections for a number of species of interest in combustion and aerothermodynamic applications. A general function for the temperature dependence of the cross-section for collisional quenching of OH A(sup 2) Sigma(sup +) is derived. Curve-fitting coefficients for a number of collision partners are tabulated.

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