Rovibrational energy transfer and dissociation in O2–O collisions
Abstract
A set of state-specific transition rates for each rovibrational level is generated for the O2(X3Σg−)–O3P system using the quasi-classical trajectory method at temperatures observed in hypersonic flows. A system of master equations describes the relaxation of the rovibrational ensemble to thermal equilibrium under ideal heat bath conditions at a constant translational temperature. Vibrational and rotational relaxation times, obtained from the average internal energies, exhibit a pattern inherent in a chemically reactive collisional pair. An intrinsic feature of the O3 molecular system with a large attractive potential is a weak temperature dependence of the rovibrational transition rates. For this reason, the quasi-steady vibrational and rotational temperatures experience a maximum at increasing translational temperature. The energy rate coefficients, that characterize the average loss of internal energy due to dissociation, quickly diminish at high temperatures, compared to other molecular systems.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 08, 2016
- Source ID
- 10.1063/1.4943114
Entities
People
- Daniil A Andrienko
- Iain D. Boyd
Organizations
- Air Force Office of Scientific Research
- University of Michigan