Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa31a1603s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA31A-1603
Other
0340 Middle Atmosphere: Composition And Chemistry, 0342 Middle Atmosphere: Energy Deposition (3334), 0343 Planetary Atmospheres (5210, 5405, 5704), 0355 Thermosphere: Composition And Chemistry
Scientific paper
Models of 15 micron emission, an important cooling mechanism in the lower thermosphere, require a rate coefficient for the excitation of the bending mode (ν2) of CO2 by atomic oxygen that is 2-3 times larger than that measured in the laboratory. This has motivated us to look for other mechanisms for energy deposition in the ν2 mode. Since the bending mode is strongly coupled to the symmetric stretch mode (ν1) due to Fermi resonance the deposition of energy in the latter mode is equivalent to deposition in the former mode. There are several mechanisms for production of vibrationally excited O¬2 in the lower thermosphere. In this talk we present a calculation of the rate of energy transfer from O2 (band origin at 1556 cm-1) to the symmetric stretch (ν1) mode of CO2 (band origin at 1388 cm-1) and discuss its feasibility as a cooling mechanism.
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