Infrared Absorptions near Three Microns Recorded over the Polar Cap of Mars

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Science  24 Oct 1969:
Vol. 166, Issue 3904, pp. 496-499
DOI: 10.1126/science.166.3904.496


During the Mariner 7 flyby of Mars, the infrared spectrometer recorded distinct, sharp absorption. near 3020 and 3300 reciprocal centimeters between 61°S and 80°S. at the edge of the southern polar cap, with maximum optical density near 68°S and 341°E. These hands, which match in frequency the v3 bands of methane and ammonia, can be associated with previously unreported spectral features of solid carbon dioxide exceeding 1 millimeter in thickness. Possible reasons for the geographic localization are discussed.

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