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Neon isotopic measurements using high-resolution, multicollector noble gas mass spectrometer: HELIX-MC

Abstract : We describe a new high-resolution, multicollection, noble gas mass spectrometer, the HELIX-MC, developed by GV instruments. The instrument uses a collector housing that holds five "MiniDual" detection systems, each detector containing two devices: a Faraday cup collector and channel electron multiplier. Each detector is 5.2 mm wide, which permits collecting adjacent beams separated by 1 atomic mass unit (amu) at mass 136. The HELIX-MC operates at high mass resolution (m/Δm > 1500), which allows the interference of 40Ar++ on 20Ne+ to be resolved. We report the results of some tests on the "MiniDual" collectors, in which we have achieved precise Ne abundance and isotopic measurements. After a correction for doubly ionized CO2 (0.37-1.5%), our results show that the HELIX-MC produces only very limited instrumental Ne isotopic mass fractionation (≈-0.5%.amu-1). The sensitivity of the HELIX-MC for neon measurement performed on 1012 ohms collector is around 1.4 × 10-3 A torr-1 for quantities of 20Ne analyzed comprised between 1.27 × 10-15 and 4.71 × 10-15 moles. Within this range, the reproducibility of the isotopic measurements of standard gas falls in the range between 0.5 and 0.8% (1σ) for 20Ne/22Ne and 1 and 1.5% for 21Ne/22Ne over a period of several days. The machine characteristics for measuring He are also reported.
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Geochem Geophys Geosyst - 2009...
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y. Marrocchi, P. G. Burnard, D. Hamilton, A. Colin, M. Pujol, et al.. Neon isotopic measurements using high-resolution, multicollector noble gas mass spectrometer: HELIX-MC. Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2009, 10, ⟨10.1029/2008GC002339⟩. ⟨insu-03619251⟩



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