Temperature dependence of the molecular oxygen photoabsorption cross section near the H Lyman-alpha line

Details Temperature dependence of the molecular oxygen photoabsorption cross section near the H Lyman-alpha line Temperature dependence of the molecular oxygen photoabsorption cross section near the H Lyman-alpha line

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1955c&link_type=abstract

Journal of Geophysical Research, vol. 82, May 1, 1977, p. 1955-1960. Research supported by the Australian Research Grants Commi

Physics

3

Absorption Cross Sections, Atmospheric Attenuation, Lyman Alpha Radiation, Molecular Absorption, Oxygen, Photoabsorption, H Alpha Line, Solar Radiation, Temperature Effects

Scientific paper

Molecular oxygen photoabsorption cross sections have been measured at 0.2-A intervals between 1214.0 and 1218.6 A at temperatures of 294, 195, and 82 K. The measured pressure dependence of the cross sections is in satisfactory agreement with earlier observations, but the room-temperature cross sections are found to be significantly different from previously reported high-resolution measurements in the Lyman-alpha window. At the lower temperatures the shape of the cross-section curve changes, and the cross sections near the absorption minimum are found to be substantially less than at room temperatures. Application of these results to analysis of rocket measurements of the extinction of solar Lyman-alpha radiation in the atmosphere is discussed, and it is shown that it is essential to take into account both the temperature and the wavelength dependence of the molecular oxygen photoabsorption cross section if reliable oxygen concentrations are to be deduced from the rocket measurements.

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