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The Genesis Solar Wind Concentrator Target: Mass Fractionation Characterised by Neon Isotopes |
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| Authors: | V S Heber R C Wiens D B Reisenfeld J H Allton H Baur D S Burnett C T Olinger U Wiechert R Wieler |
| Institution: | (1) Isotope Geology and Mineral Resources, ETH, 8092 Zürich, Switzerland;(2) LANL, Space & Atmospheric Science, Los Alamos, NM 87544, USA;(3) Physics and Astronomy, University of Montana, Missoula, MT 59812, USA;(4) JSC, 2101 NASA Parkway, Houston, TX 77058, USA;(5) CalTech, JPL, Pasadena, CA 91109, USA;(6) AG Geochemie, FU Berlin, 12249 Berlin, Germany |
| Abstract: | The concentrator on Genesis provided samples of increased fluences of solar wind ions for precise determination of the oxygen isotopic composition. The concentration process caused mass fractionation as a function of the radial target position. This fractionation was measured using Ne released by UV laser ablation and compared with modelled Ne data, obtained from ion-trajectory simulations. Measured data show that the concentrator performed as expected and indicate a radially symmetric concentration process. Measured concentration factors are up to ∼30 at the target centre. The total range of isotopic fractionation along the target radius is 3.8%/amu, with monotonically decreasing 20Ne/22Ne towards the centre, which differs from model predictions. We discuss potential reasons and propose future attempts to overcome these disagreements. |
| Keywords: | Solar wind Noble gases Genesis oxygen isotopic analysis UV laser ablation |
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