An important aspect of noble gas geochemistry is the discovery of non-atmospheric neon isotopic ratios in mantle-derived samples, including basalts or diamonds. Neon has three isotopes, 20Ne, 21Ne, and 22Ne with isotopic ratios of 9.8 and 0.029 in the atmosphere, for 20Ne/22Ne and 21Ne/22Ne, respectively. There are two main difficulties in analysing precisely these two isotopic ratios in mantle-derived rocks. The first is the peak superposition of 40Ar++ and CO2++, two abundant elements in mantle-derived gas, which requires efficient gas purification, e.g., perfect separation between...

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