A "pickup ion" typically refers to an ion that is formed when a neutral atom or molecule becomes ionized by the process of "pickup." This can occur in various contexts, such as in astrophysics or ionospheric studies, typically involving neutral atoms or molecules capturing energetic particles or radiation that causes them to become ionized. In astrophysics, for instance, pickup ions can be created when neutral hydrogen atoms in space collide with energetic particles, such as solar wind protons or other ions.
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