The reflectance spectrum of Io can be explained by a surface layer consisting of fine-grained particles of sublimated alkali sulphides and sulphur on which H2S and SO2 are adsorbed.
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Nash, D., Nelson, R. Spectral evidence for sublimates and adsorbates on Io. Nature 280, 763–766 (1979). https://doi.org/10.1038/280763a0
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DOI: https://doi.org/10.1038/280763a0
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