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    Focused ion beam recovery of hypervelocity impact residue in experimental craters on metallic foils

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    Author
    Graham, G. A.
    Teslich, N.
    Dai, Z. R.
    Bradley, J. P.
    Kearsley, A. T.
    Hörz, F.
    Issue Date
    2006-01-01
    Keywords
    stardust space missions
    Scanning electron microscopy (SEM)
    impact microcraters
    
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    Citation
    Graham, G. A., Teslich, N., Dai, Z. R., Bradley, J. P., Kearsley, A. T., & Hörz, F. (2006). Focused ion beam recovery of hypervelocity impact residue in experimental craters on metallic foils. Meteoritics & Planetary Science, 41(2), 159-165.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656097
    DOI
    10.1111/j.1945-5100.2006.tb00200.x
    Additional Links
    https://meteoritical.org/
    Abstract
    The Stardust sample return capsule returned to Earth in January 2006 with primitive debris collected from Comet 81P/Wild-2 during the fly-by encounter in 2004. In addition to the cometary particles embedded in low-density silica aerogel, there are microcraters preserved in the aluminum foils (1100 series; 100 micrometers thick) that are wrapped around the sample tray assembly. Soda lime spheres (~49 micrometers in diameter) have been accelerated with a light gas gun into flight-grade aluminum foils at 6.35 km s^(-1) to simulate the capture of cometary debris. The experimental craters have been analyzed using scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDX) to locate and characterize remants of the projectile material remaining within the craters. In addition, ion beam-induced secondary electron imaging has proven particularly useful in identifying areas within the craters that contain residue material. Finally, high-precision focused ion beam (FIB) milling has been used to isolate and then extract an individual melt residue droplet from the interior wall of an impact. This has enabled further detailed elemental characterization that is free from the background contamination of the aluminum foil substrate. The ability to recover "pure" melt residues using FIB will significantly extend the interpretations of the residue chemistry preserved in the aluminum foils returned by Stardust.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2006.tb00200.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 41, Number 2 (2006)

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