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Photodissociation of carbon dioxide produces O ( 1 S) atoms and CO (a 3 Π) molecules in the Mars upper atmosphere. Calculations of the emission rate of the atomic oxygen 2972 Å line and the carbon monoxide Cameron bands produced by the photodissociation mechanism are factors of 3 and 10, respectively, smaller than the emission rates observed by Mariner ultraviolet spectrometers. Laboratory measurements are needed to understand the discrepancies.

Photodissociation of Carbon Dioxide in the Mars Upper Atmosphere