Derivation of optical constants for nanophase hematite and application to modeled abundances from in-situ Martian reflectance spectra

摘要

Highlights?Bulk hematite optical constants cannot be used to model nanophase hematite spectra.?We produced a new set of fine-grained hematite optical constants.?Major spectral units seen in Curiosity's first year contain?AbstractSeveral studies have detected the presence of nanophase ferric oxide, such as nanophase hematite, across the martian surface through spacecraft and rover data. In this study, we used the radiative transfer method to detect and quantify the abundance of these nanophase particles. Because the visible/near-infrared spectral characteristics of hematite?>?10?nm in size are different from nanophase hematite?