Grant/Award Number and Agency
The Advanced Light Source is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231.
Space weathering processes induce changes to the physical, chemical, and optical properties of space-exposed soil grains. For the Moon, space weathering causes reddening, darkening, and diminished contrast in reflectance spectra over visible and near-infrared wavelengths. The physical and chemical changes responsible for these optical effects occur on scales below the diffraction limit of traditional far-field spectroscopic techniques. Recently developed super-resolution spectroscopic techniques provide an opportunity to understand better the optical effects of space weathering on the sub-micrometer length scale. In this paper, we used a synchrotron-based spectroscopic technique with ∼20 nm spatial resolution to examine cross-sections from two mature lunar soils at midinfrared wavelengths (700–2000 cm−1; 5–14.3 µm). Our findings are broadly consistent with prior bulk observations and theoretical models of space weathered spectra of lunar materials. These results provide a direct spatial link between the physical/chemical changes in space-exposed grain surfaces and spectral changes of space-weathered bodies.
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Utt, Kainen L.; Ogliore, Ryan C.; Bechtel, Hans A.; Gillis-Davis, Jefferey J.; and Jolliff, Bradley L., "[currently in curation] Data for "Spatially-Resolved Mid-Infrared Spectral Evidence of Space Weathering"" (2020). Digital Research Materials (Data & Supplemental files). 27.