Reflectance spectra for sodium and potassium doped ammonia frosts - Implications for Io's surface

Computer Science

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Ammonia, Frost, Io, Planetary Surfaces, Spectral Reflectance, Additives, Albedo, Planetary Composition, Potassium, Sodium

Scientific paper

This paper reports measurements of the reflection spectra of sodium- and potassium-doped ammonia frosts as a function of alkali metal concentration for the wavelength range 0.35-2.5 microns. The purpose of the measurements was to determine whether or not the reflection spectra for such a solid was compatible with the spectra albedo of Io. The data show that, with a sufficiently large alkali metal concentration, the reflection spectra of the doped ammonia frosts do not display the characteristic ammonia features at 2.0 and 2.25 micron. The high reflectance of the more concentrated samples and the character of the observed reflection spectrum make it difficult to rule out sodium-doped ammonia frost as a surface constituent on Io on the basis of existing data.

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