Physics – Space Physics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1109h&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 108, Issue A3, pp. SIA 4-1, CiteID 1109, DOI 10.1029/2002JA009688
Physics
Space Physics
7
Atmospheric Composition And Structure: Middle Atmosphere-Energy Deposition, Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry
Scientific paper
Vibrational excitation of ground-state NO through collisions with oxygen atoms produces NO(v = 1) in the lower thermosphere, representing a significant source of atmospheric cooling through the subsequent 5.3-μm radiative emission. A laser pump-probe experiment has been used to measure the temperature dependence of the NO(v = 1)-O vibrational relaxation rate coefficient kO(v = 1) in the 295-825 K range, along with updated measurements of kO(v = 1,2) at room temperature. The experiment employed a continuous wave microwave source to form O atoms, combined with photolysis of a trace amount of added NO2 to produce vibrationally excited NO. Oxygen atoms were detected through two-photon laser-induced fluorescence, cross-calibrated against a normalized O atom signal resulting from photolysis of a known concentration of NO2. No temperature dependence was observed for kO(v = 1) to within the uncertainty in the measurements. The measured room temperature value of kO(v = 1) = (4.2 +/- 0.7) × 10-11 cm2 s-1 is 75% larger than the value obtained previously in this laboratory, a significant difference at the 1σ level. The present value is preferred owing to an improved experimental technique. The atmospherically relevant NO(v = 0)-O vibrational excitation rate coefficient can be derived from measured values of kO(v = 1) through detailed balance. The variable temperature measurements provide key information for aeronomic models of the lower thermospheric energy budget, infrared emission intensities, and neutral constituent densities.
Castle Karen J.
Dodd James A.
Hwang Eunsook S.
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