Coatings and weathering rinds at Gusev crater, Mars, investigated by depth selective Mossbauer spectroscopy
2008
Fleischer, Iris | Klingelhoefer, Goestar | Schröder, Christian | Rodionov, Daniel S | Johannes Gutenberg University of Mainz | Johannes Gutenberg University of Mainz | Biological and Environmental Sciences | Johannes Gutenberg University of Mainz | 0000-0002-7935-6039
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.
显示更多 [+] 显示较少 [-]