Physics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978cosp.meetr....h&link_type=abstract
COSPAR, Plenary Meeting, 21st, Innsbruck, Austria, May 29-June 10, 1978, Paper. 20 p.
Physics
Chemical Reactions, Gas Exchange, Mars Surface, Oxidation, Photoelectron Spectroscopy, Ultraviolet Radiation, Emission Spectra, Hydrogen Peroxide, Iron Oxides, Manganese Oxides, Mars Atmosphere, Transition Metals, Water Vapor
Scientific paper
Ultraviolet irradiation of pyrolusite (beta-MnO2) and hematite (alpha-Fe2O3) in a humid oxygen-rich Mars atmosphere produced changes in the oxygen (1s) and manganese (3p) binding energies as measured by X-ray photoelectron (ESCA) spectroscopy. The changes on MnO2 are consistent with the formation of a surface layer of an oxide of Mn(V) or (VI) which, by reference to the properties of the bulk materials, would be highly oxidizing. The change in the O(1s) spectrum is not as easily interpreted; chemisorbed O may account for it. A gas-exchange experiment on UV-irradiated MnO2 powder results in oxygen evolution on exposure to water vapor. Thus transition-metal surface chemistry may play an indicator role in the explication of extraterrestrial regolith chemistry.
Blackburn Thomas R.
Holland Heineich D.
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