Temperature dependence of the carbon dioxide photoabsorption cross section between 1200 and 1970 A

Physics

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Absorption Cross Sections, Carbon Dioxide, Mars Atmosphere, Photoabsorption, Planetary Temperature, Atmospheric Chemistry, Photodissociation, Temperature Dependence, Ultraviolet Absorption

Scientific paper

Photoabsorption cross sections have been measured for carbon dioxide at 0.5 Å intervals between 1200 and 1970 Å. The instrumental resolution was about 0.05 Å and measurements were performed using relatively low pressures at temperatures near 200, 300, and 370K. The room temperature cross sections are found to be in good agreement with previous measurements and a temperature effect is found which is small at the shorter wavelengths, passing through a minimum near 1400 Å. At longer wavelengths the temperature effect increases steadily until at some fixed wavelengths above 1900 Å the cross section increases by a factor of about 20 as the temperature is increased from 200 to 370K. This behaviour is of particular significance to calculations of carbon dioxide photodissociation rates at low altitudes in the Martian atmosphere.

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