Optical properties of solid CO2 - Application to Mars

Details Optical properties of solid CO2 - Application to Mars Optical properties of solid CO2 - Application to Mars

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.8294d&link_type=abstract

Journal of Geophysical Research, vol. 84, Dec. 30, 1979, p. 8294-8300.

Physics

8

Carbon Dioxide, Gas Spectroscopy, Mars Surface, Optical Properties, Polar Caps, Solidified Gases, Absorptivity, Brightness Temperature, Emissivity, Error Analysis, Mars Atmosphere, Planetary Meteorology, Refractivity, Thermal Mapping, Vacuum Chambers, Viking Spacecraft

Scientific paper

Using a special low-temperature cell, thick layers of solid CO2 are grown on an infrared-transparent window. The transmission spectra of solid CO2 is measured from 4000 to 360 kaysers (2.5-27.8 microns). The complex index of refraction is derived for samples of different thicknesses. Scattering in the samples is the major source of error. Away from the major absorption bands the imaginary index is very low. The absorption coefficient is of the order of 1 kayser. The emissivity in the Viking IRTM 20-micron band of a solid surface of CO2 is estimated at 0.72 + 0.17 or -0.10. Snowlike deposits have similar or lower emissivity. The results of this paper relieve the need for exceptional meteorology to explain Martian brightness temperatures below the CO2 frost point.

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