Nitric oxide delta band emission in the earth's atmosphere - Comparison of a measurement and a theory

Physics

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Earth Atmosphere, Emission Spectra, Molecular Spectroscopy, Nitric Oxide, Spectral Emission, Night Sky, Photochemical Reactions, Spectral Bands, Ultraviolet Spectrometers, Vertical Distribution

Scientific paper

Attention is given to the altitude dependent emission rate in the delta-bands of nitric oxide as measured in the earth's atmosphere at night by a scanning ultraviolet spectrometer. It is noted that the reaction responsible is the two-body association of nitrogen and oxygen atoms. The measurements show a vertical intensity beneath the layer for the delta-band system of 19 R. The horizontal emission rate is found to increase from 70 R at 117 km to 140 R at 150 km. The data are analyzed with a one-dimensional, time-dependent, vertical-transport model of odd nitrogen photochemistry. The calculated and measured intensities agree so long as the quenching of N(2D) by atomic oxygen is near 5 x 10 to the -13 cu cm/sec.

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