Coatings and weathering rinds at Gusev crater, Mars, investigated by depth selective Mössbauer spectroscopy

Details Coatings and weathering rinds at Gusev crater, Mars, investigated by depth selective Mössbauer spectroscopy Coatings and weathering rinds at Gusev crater, Mars, investigated by depth selective Mössbauer spectroscopy

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hyint.186..193f&link_type=abstract

Hyperfine Interactions, Volume 186, Issue 1-3, pp. 193-198

Physics

Depth Selective M&Ouml, Ssbauer Spectroscopy, Mars Exploration Rover Mission, Iron Mineralogy, Geochemistry

Scientific paper

The miniaturised Mössbauer spectrometer (MIMOS II) is part of the scientific payload of the two Mars Exploration Rovers, “Spirit” and “Opportunity” (Klingelhöfer et al., J Geophys Res 108(E12), 2003). MIMOS II can obtain 14.4 keV γ-ray spectra and 6.4 keV X-ray spectra simultaneously in backscattering geometry. Comparing 6.4 keV and 14.4 keV spectra yields depth selective information about a sample and allows for the detection and characterization of thin coatings or weathering rinds. Laboratory measurements and a Monte Carlo simulation were used to study the influence of coatings of varying thickness and composition on backscattering Mössbauer spectra. The thickness of thin surface layers on natural samples can be estimated by comparing measured and the corresponding simulated spectra.

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