Altitude distribution of vibrationally excited states of atmospheric hydroxyl at levels v = 2 to v = 7

Computer Science – Sound

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Airglow, Atmospheric Chemistry, Hydroxyl Radicals, Vertical Distribution, Vibrational Spectra, Altitude, Mesosphere, Oxygen Atoms, Photochemical Reactions

Scientific paper

An instrument for the measurement of three different IR regions of the OH Meinel system was launched in night conditions from El Arenosillo Sounding Rocket Range (Spain). The instrument covered transitions between vibrational states from v = 2 to v = 7 in the first overtone sequence. The altitude profiles of the concentration of vibrationally excited OH in the vibrational levels 2 to 7 are deduced. The individual profiles show that there is a dependence of the characteristics of the layers (altitude of the peak and half width) on the vibrational level. The lower levels extend to lower altitude than the higher ones. The obtained profiles are used, on the basis of a photochemical model, to investigate the values for the rate constants of the production and the chemical and collisional deactivation of excited atmospheric OH.

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