Noble gases are useful tracers for geochemistry, used to elucidate the origin and evolution of the solar system and planets. Noble gas analyses have been limited to bulk and spot analyses of solids and have yet to be developed for two- and three-dimensional imaging analysis. Recent developments in He isotope imaging using secondary neutral mass spectrometry are reviewed. The images have been fully quantified, and the spatial resolution has reached the nanoscale. The detection limit has been reduced to the level of ~ 10–3 cm3 STP g−1 (~ 1017 cm−3, ~ 1 ppma) for helium at lateral micrometer resolution. With this development, the concentration distribution of He in solids has been visualized as a map for the first time.

中文翻译：

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固体中稀有气体的纳米级分析

稀有气体是地球化学的有用示踪剂，用于阐明太阳系和行星的起源和演化。稀有气体分析仅限于固体的整体和点分析，尚未开发用于二维和三维成像分析。综述了使用二次中性质谱法的 He 同位素成像的最新进展。图像已完全量化，空间分辨率达到纳米级。在横向微米分辨率下，氦气的检测限已降至约 10–3 cm3 STP g−1（约 1017 cm−3，约 1 ppma）的水平。随着这一进展，固体中 He 的浓度分布首次以地图形式可视化。