Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617497b&link_type=abstract
(International Conference on Laboratory Research for Planetary Atmospheres, 2nd, Charlottesville, VA, Oct. 21, 1990, Proceedings
Physics
6
Absorption Spectra, Carbon Dioxide, Planetary Radiation, Spectrum Analysis, Venus Atmosphere, Gratings (Spectra), Night Sky, Planetary Composition, Spectral Energy Distribution, Sulfuric Acid
Scientific paper
Thermal emission from the deep atmosphere of Venus can be detected on the nightside around 2.3 microns. The analysis of this radiation requires a reliable knowledge of the absorption in the far wings of the nearby allowed CO2 bands and of the absorption due to collision-induced bands. Absorption coefficients were measured for pure CO2 at pressures varying from 30 to 60 bars in the frequency range 3910-4570/cm at 297.5 K. Values between 1.0 and 1.6 x 10 to the -7th/cm/sq amagat are found in the 4100-4500/cm interval where emission from the Venus nightside occurs. The comparison of experimental results with synthetic spectra calculated from a line by line code demonstrates that the Lorentzian line shape strongly overestimates the observed absorption, whereas the use of a chi factor extrapolated from the 3800-4000/cm region does not provide enough opacity.
Bezard Bruno
Bouanich Jean-Pierre
Boulet Cilanne
Brodbeck Claude
de Bergh Catherine
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