Simulation of solar wind space weathering in orthopyroxene

摘要: Abstract We have simulated solar wind-based space weathering on airless bodies in our Solar System by implanting hydrogen and helium into orthopyroxene at wind energies (~1 keV/amu). Here we present the results of first scanning transmission electron microscope (STEM) study one these simulants. It has been demonstrated that visible/near infrared (VNIR) reflectance spectra are dependent size abundance nanophase iron (npFe 0 ) particles outer rims regolith grains. However, mechanism formation npFe patina lunar grains agglutinates remains debated. As lattice is disrupted implantation, broken bonds created. These dangling free to react with hydrogen, creating OH and/or H 2 O molecules within grain. may diffuse out through damaged migrate toward cold traps identified poles. This would leave a reduced state able form . work illustrates can be nucleated under implantation helium. Our data suggest provides which grain surfaces should also operate other System.