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Triple Oxygen Isotope Measurements by Multi-Collector Secondary Ion Mass Spectrometry

Abstract : Secondary ion mass spectrometry (SIMS) is a powerful technique for in situ triple oxygen isotope measurements that has been used for more than 30 years. Since pioneering works performed on small-radius ion microprobes in the mid-80s, tremendous progress has been made in terms of analytical precision, spatial resolution and analysis duration. In this respect, the emergence in the mid-90s of the large-radius ion microprobe equipped with a multi-collector system (MC-SIMS) was a game changer. Further developments achieved on CAMECA MC-SIMS since then (e.g., stability of the electronics, enhanced transmission of secondary ions, automatic centering of the secondary ion beam, enhanced control of the magnetic field, 10 12 Ω resistor for the Faraday cup amplifiers) allow nowadays to routinely measure oxygen isotopic ratios (18 O/ 16 O and 17 O/ 16 O) in various matrices with a precision (internal error and reproducibility) better than 0.5‰ (2σ), a spatial resolution smaller than 10 µm and in a few minutes per analysis. This paper focuses on the application of the MC-SIMS technique to the in situ monitoring of mass-independent triple oxygen isotope variations.
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Submitted on : Friday, October 22, 2021 - 11:02:38 AM
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Nordine Bouden, Johan Villeneuve, Yves Marrocchi, Etienne Deloule, Evelyn Füri, et al.. Triple Oxygen Isotope Measurements by Multi-Collector Secondary Ion Mass Spectrometry. Frontiers in Earth Science, Frontiers Media, 2021, 8, pp.601169. ⟨10.3389/feart.2020.601169⟩. ⟨hal-03394763⟩



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