Other
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..563m&link_type=abstract
Geophysical Research Letters, vol. 6, July 1979, p. 563-565.
Other
1
Hydrochloric Acid, Molecular Spectra, Pressure Broadening, Solar Spectra, Air, Collision Parameters, Cross Sections, Spectral Line Width, Temperature Dependence
Scientific paper
Recent experimental results indicate that the collision cross sections between infrared-absorbing molecules and non-absorbing colliding partners exhibit considerable temperature dependence in the atmospheric temperature range. This dependence has to be taken into account when deconvoluting solar spectra into molecular mixing ratios. On the basis of experimental results for the HCl-Ar system, a simple calculation is made to assess the magnitude of this effect for HCl-air. The calculated temperature effect is found to be small (approximately 4 percent). However, conditions where this effect is much larger and more significant are discussed. The direction of the effect is clear. The increasing cross sections (with decreasing temperatures) lead to smaller deduced concentrations. Since this is potentially a significant correction affecting not only the absolute magnitude of mixing ratios but also the altitude profiles of HCl and other key atmospheric components, it is suggested that the definitive experiments be carried out for the various atmospheric broadening systems.
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