Ellipsometry, Reflectance and Emittance Spectrocopy of Quartz Particle Size Separates, Palagonitic Soils and Montmorillonite. Implications for Remote Sensing of Planetary Surfaces

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Mars: Analogs, Spectroscopy: Emittance, Spectroscopy: Reflectance, Surfaces: Planetary

Scientific paper

Infrared reflectance and relative emittance of Mars analogs have been measured, resulting in emittance spectra that show inversely similar spectral features to the reflectance spectra. Absolute emittance can be derived when a wavelength range exists at which emittance equals one. This takes place at the short wavelength flank of strong absorption bands, where the refractive index of the material is close to the refractive index of air. The emittance spectra of the fine-grained palagonitic soil and montmorillonite exhibit dominant features at 6 micrometers due to the H-O-H bending mode and near 8 micrometers as the real part of the refractive index approaches a minimum. In the reststrahlen region, where the optical constants undergo rapid change, weak bands are observed for these samples.

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