Roles of Electron and Photon Induced Desorption in the Formation of Mercury's Exosphere

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Mercury is surrounded by an exosphere whose properties are determined primarily by its interaction with the surface and the space environment seen by both ground- and space-based observation.[1, 4, 6] The primary processes thought to be governing the ejection of materials into the exosphere are high energy ion sputtering, thermal desorption, micrometeorite impact and non-thermal desorption. When photons or electrons are involved, these nonthermal processes are usually referred to as photon stimulated desorption (PSD) or electron-stimulated desorption (ESD), respectively.[2, 3] These radiolytic and space weathering processes (i.e., ion sputtering, PSD and ESD) are of general importance, not only for Mercury but for other airless bodies, such as moons and asteroids, that interact with solar wind and magnetospheric plasmas. Laboratory measurements are being performed to determine the efficiency of these non-thermal processes in removing ionic and neutral species from minerals likely to be present on Mercury's surface.

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