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    Non-mass-dependent oxygen isotopic fractionation in smokes produced in an electrical discharge

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    Author
    Kimura, Y.
    Nuth, J. A.
    Chakraborty, S.
    Thiemens, M. H.
    Issue Date
    2007-01-01
    Keywords
    isotope fractionations
    Solar System origins
    oxygen isotopes
    Nebular condensation
    
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    Citation
    Kimura, Y., Nuth, J. A., Chakraborty, S., & Thiemens, M. H. (2007). Non‐mass‐dependent oxygen isotopic fractionation in smokes produced in an electrical discharge. Meteoritics & Planetary Science, 42(7-8), 1429-1439.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656314
    DOI
    10.1111/j.1945-5100.2007.tb00583.x
    Additional Links
    https://meteoritical.org/
    Abstract
    We report the first production of non-mass-dependently fractionated silicate smokes from the gas phase at room temperature from a stream of silane and/or pentacarbonyl iron in a molecular hydrogen (or helium) flow mixed with molecular oxygen (or nitrous oxide). The smokes were formed at the Goddard Space Flight Center (GSFC) at total pressures of just under 100 Torr in an electrical discharge powered by a Tesla coil, were collected from the surfaces of the copper electrodes after each experiment and sent to the University of California at San Diego (UCSD) for oxygen isotopic analysis. Transmission electron microscopy studies of the smokes show that they grew in the gas phase rather than on the surfaces of the electrodes. We hypothesize at least two types of fractionation processes occurred during formation of the solids: a mass-dependent process that made isotopically lighter oxides compared to our initial oxygen gas composition followed by a mass-independent process that produced oxides enriched in 17O and 18O. The maximum Delta-17O observed is +4.7 per mil for an iron oxide produced in flowing hydrogen, using O2 as the oxidant. More typical displacements are 1-2 per mil above the equilibrium fractionation line. The chemical reaction mechanisms that yield these smokes are still under investigation.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2007.tb00583.x
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    Meteoritics & Planetary Science, Volume 42, Number 7-8 (2007)

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