Helium is the second abundant element in the solar wind and is important to understand mechanisms of space weathering and solar activities. However, in-situ analysis of He is difficult in solids because of the low abundance and the extremely low ionization yield. We are currently under development of new instruments of sputtered neutral mass spectrometry and recently succeeded to measure He depth profiling from a Genesis sample exposed Solar winds.
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Institute for Planets and Exoplanets
