Journal
CHEMICAL PHYSICS
Volume 491, Issue -, Pages 74-81Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2017.05.005
Keywords
Quasiclassical trajectory method; Molecular oxygen; Tetraoxygen; Hypersonic flow; Vibrational relaxation
Funding
- Air Force Office of Scientific Research [FA9550-16-1-0291]
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State-specific dissociation rate coefficients of oxygen in collisions with another oxygen molecule are obtained using the quasiclassical trajectory method on a six-dimensional potential energy surface at high temperatures characteristic of hypersonic flows. The present results indicate that O-2-O-2 rate coefficients can not be obtained by a simple scaling of a simpler O-2-O dataset. A difference is observed between the present rate coefficients and those obtained via the preferential dissociation and forced harmonic oscillator models. Depletion via an exchange mechanism significantly contributes to the total dissociation rate at low temperatures and at low vibrational energies. The new set of rate coefficients is used in a one-dimensional shock flow simulation. The computed vibrational temperature is then compared to data obtained by absorption spectroscopy in the Schumann-Runge bands. A better agreement with the experimental data is achieved at moderate levels of nonequilibrium when the new dataset is implemented. (C) 2017 Elsevier B.V. All rights reserved.
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