Infrared reflectance spectra of Na2S with contaminant Na2CO3 - Effects of adsorbed H2O and CO2 and relation to studies of Io

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Infrared Spectra, Inorganic Sulfides, Io, Satellite Atmospheres, Sodium Carbonates, Spectral Reflectance, Carbon Dioxide, Fourier Transformation, Water Vapor, Jupiter, Infrared, Reflectance, Spectra, Contamination, Absorption, Io, Water, Carbon Dioxide, Satellites, Carbonate, Composition, Brightness, Sodium Carbonate, Laboratory Studies, Sodium Sulfide

Scientific paper

A previously published IR reflectance spectrum of Na2S, a candidate surface component on Jupiter's satellite Io, showed a weak but distinct band at approximately 4.04 μm that was interpreted as due to chemisorbed H2S or SO2. New spectra have been obtained on Na2S powder showing that this 4-μm band is not due to H2S or SO2, but rather Na2CO3, a contaminant present in the original material. Because of the extreme hygroscopic nature of Na2S, a reflectance spectrum of pure Na2S is not yet available. But the apparent high IR brightness of Na2S and the spectral neutrality in the range 1 - 5 μm suggest that it could be a component on Io's surface.

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