Ejection of sodium from sodium sulfide by the sputtering of the surface of Io

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Inorganic Sulfides, Io, Satellite Atmospheres, Satellite Surfaces, Sodium, Sputtering, Atmospheric Density, Ejection, Energy Spectra, Jupiter (Planet), Mass Spectra, Molecular Collisions, Planetary Magnetospheres, Plasma Composition, Thin Films

Scientific paper

The discovery of sodium D-line emission from Io and that these atoms form an extended cloud was the first evidence that the surface of Io might supply material to the Jovian magnetospheric plasma. In this paper the authors describe the sputtering of Na2S. The production of thin films of Na2S, which are necessary to produce any meaningful sputtering measurements, accounted for the majority of time spent in researching this system. The experimental results are used to explore the possibility of ion-induced ejection of sodium from Na2S in terms of supplying the necessary injection rate of sodium atoms. The authors also incorporate our experience with sulfur sputtering in order to consider other possible sulfides or sodium-containing surface materials.

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