Detection in the Infrared of Mg+ḑotCO2 Ion produced via Meteoritic Material in the Martian Atmosphere

Astronomy and Astrophysics – Astronomy

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The ion Mg+ḑotCO2 has been identified as a constituent of the Martian ionosphere. Numerous Mars Global Surveyor Thermal Emission Spectrometer infrared limb spectra were analyzed through a complete Martian year. Two infrared features, the first near 26 μ m and the second near 23 μ m, have been identified as due to Mg+ḑotCO2. This ion originates as the result of ablation of meteoritic material in the Martian atmosphere in the altitude range 80-120 km. Neutral magnesium is one of the metals deposited in the atmosphere during meteoritic ablation. The ambient ions O2+ and CO2+ charge exchange with neutral magnesium to produce the atomic ion Mg+. The Mg+ reacts with the principal atmospheric constituent CO2 via the reaction Mg+ + CO2 + CO2 -> Mg+ḑotCO2 + CO2. The global and temporal distributions of this cluster are shown as well as the altitude distribution of its column abundance.
Funding for this research is provided partially by the NASA Mars Data Analysis Program.

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