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We performed pulse-laser irradiation experiments of a primitive meteorite to simulate space weathering by micrometeorite bombardments on C-type asteroids. Pellets of powdered Murchison CM2 chondrite were set in vacuum and exposed to pulse laser with a diameter of 0.5mm and delivered energies of 5, 10, and 15mJ. We measured reflectance spectra of unirradiated and irradiated surfaces of the pellets...
By means of nanoscale surface observation, we have proposed a new approach for investigating fine crystals of cosmic materials to reveal their origin and growth conditions. Several different morphologies of polyhedral fine olivines with faceted faces have been found in Allende carbonaceous chondrite (4.5byr in geochronological age). In the present work, molecular level topography of the faceted matrix...
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