Trace element analysis
Current Members Involved: Andrew Davis, Andrew Regula, Thomas Stephan
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The typical techniques for measuring trace element abundances (LA-ICPMS, SIMS, EPMA) are not ideal due to their inability to resolve isobaric interferences, their low useful yields, and high detection limits. We intend to utilize the strengths of CHILI (high spatial resolution and useful yield, separation of isobaric interferences) as another, perhaps more suitable technique for in-situ trace element analysis.
Cross-section of an iron-nickel meteorite on display at the Smithsonian.
(Image credit: Chuck Sutherland)
Back-scattered electron (BSE) image of a polished section of the iron meteorite Tlacotepec.
(Image credit: Andrew Regula)
BSE image of a polished section of the iron meteorite Skookum.
(Image credit: Andrew Regula)
(Image credit: Andrew Regula)
In order to quantify elemental abundance measurements made with CHILI, the relative sensitivity factor (RSF) for the elemental ratio of interest must be determined. For example, the RSF for the ratio of Ru to Mo is equal to [Ru+/Mo+]CHILI/[Ru/Mo]literature. We are measuring the Ru/Mo ratio of various iron meteorites to investigate the consistency of Ru/Mo RSFs, measured using RIMS, in materials with a range of bulk compositions.
Relevant Papers Recently Published by CHILI Lab:
Relevant Papers Recently Published by CHILI Lab:
Regula A., Bloom H. E., Dauphas N., Davis A. M., Korsmeyer J. M., Krawczynski M. J., and Stephan T. (2022) Trace element ratios with CHILI: A progress report (abstract). Lunar Planet. Sci. 53, #2877. [pdf]
Regula A., Bloom H. E., Dauphas N., Davis A. M., Korsmeyer J. M., Krawczynski M. J., Pellin M. J., Sheu S., and Stephan T. (2021) Toward trace element concentrations with CHILI (abstract). Meteorit. Planet. Sci. 56, A227 (#6287). [pdf]
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