Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51d1221c&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P51D-1221
Physics
3672 Planetary Mineralogy And Petrology (5410), 3954 X-Ray, Neutron, And Electron Spectroscopy And Diffraction, 5415 Erosion And Weathering, 5494 Instruments And Techniques, 6060 Radiation And Chemistry
Scientific paper
Recent laboratory simulations of ion irradiation effects on planetary minerals show changes in the surface composition of surfaces that are different depending on whether the analysis is done in-situ (without removing the sample from vacuum) or ex-situ using an electron microscope. We found that olivine samples that have been irradiated by keV ions show preferential loss of magnesium when exposed to water. Irradiations were done with 4 keV argon ions to fluences between 1015 and 1018 ions/cm2. Soak times in high purity water ranged from minutes to days, and exhibit the same degree of Mg depletion, independent of soak time. The concentration of magnesium on the surface of irradiated natural olivine decreases by 40% upon contact with water, as measured with x-ray photoelectron spectroscopy. This finding is important for laboratory simulations of regolith processes and for establishing procedures for the handling of irradiated samples, including those from sample return missions.
Baragiola Raúl A.
Cantando E. D.
Dukes Catherine A.
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