Observation of high-N hydroxyl pure rotation lines in atmospheric emission spectra by the Cirris 1A Space Shuttle experiment

Physics

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Airglow, Atmospheric Composition, Emission Spectra, Hydroxyl Emission, Rotational Spectra, Space Shuttle Payloads, Carbon Monoxide, Cryogenic Equipment, Interferometers, Line Spectra, Molecular Energy Levels, Nitric Oxide

Scientific paper

Pure rotation line emissions from highly rotationally excited OH have been observed between 80 and 110 km tangent height under both nighttime and daytime quiescent conditions. Data were obtained using the cryogenic CIRRIS 1A interferometer, operated on the Space Shuttle. Transitions from OH were identified between 400 and 1000 per cm, corresponding to states with energies as high as 23,000 per cm. These are the first definitive observations of OH pure rotation transitions in the airglow, and by far the highest N levels observed in any type of OH airglow emission spectrum.

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