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To determine the relative rates of ion recycling to the surface and loss of ions to the solar wind, we followed 3,500 Na ions in a tight grid of magnetic and electric fields at Mercury. We conclude that up to 60% of the photoions launched on the dayside near the surface will re-impact the dayside. For a dawn – dusk electric field, we find that most of the returning ions impact the dayside. This will be the case for a southward IMF. Photoions do not impact the dayside with sufficient energy to cause secondary sputtering, but on the nightside they will be accelerated to keV energies, and may cause secondary sputtering there.
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