Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa22a14d&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA22A-14
Other
0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0355 Thermosphere--Composition And Chemistry
Scientific paper
The model of rotationally resolved 5.3 μ m thermospheric emission from the NO fundamental vibration-rotation band has provided important insights into the mechanisms leading to this emission as well as models of NO. The four major mechanisms are solar pumping, the inelastic collisions with O of NO(v=0), the reaction of N(2D) with O2, and the reaction of N(4S) with O2. An accurate prediction of the rotationally resolved emission requires a model not only of ambient NO density but also the production and loss mechanisms of nascent NO as well. Solar pumping leads to rotationally thermal 5.3 μ m emission. The inelastic O atom collisions, on the other hand, produce rotationally thermal emission at low altitudes (H<130 km) where there are few (>2) collisions during a radiative lifetime (>0.08 s), and rotationally cold emission TR ~0.75T) at higher altitudes where there are no collisions during a radiative lifetime. The reaction of N(4S) with O2 has been shown to lead to highly rotationally nonthermal 5.3 μ m emission producing R branch bandheads around 5.0 μ m. The N(2D)+O2 reaction, in the absence of data available over the entire altitude range, is assumed to lead to a rotationally thermal emission. The present work tests the validity of this assumption. Sources and sinks of N(2D) atoms in the daytime thermosphere are determined and a nonthermal energy distribution function is constructed by solving a time dependent Boltzmann equation. Quasiclassical trajectory (QCT) calculations on a recently computed ab initio potential energy surfaces are used to determine the translational energy dependence of the N(2D)+O2 reaction rate coefficient as well as the vibrational/ rotational distributions of nascent NO.
Braunstein Matthew
Dothe Hoang
Duff James W.
Sharma Ramesh D.
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