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dc.contributor.authorKimura, Y.
dc.contributor.authorNuth, J. A.
dc.contributor.authorChakraborty, S.
dc.contributor.authorThiemens, M. H.
dc.date.accessioned2021-02-12T22:30:12Z
dc.date.available2021-02-12T22:30:12Z
dc.date.issued2007-01-01
dc.identifier.citationKimura, 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.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2007.tb00583.x
dc.identifier.urihttp://hdl.handle.net/10150/656314
dc.description.abstractWe 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.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectisotope fractionations
dc.subjectSolar System origins
dc.subjectoxygen isotopes
dc.subjectNebular condensation
dc.titleNon-mass-dependent oxygen isotopic fractionation in smokes produced in an electrical discharge
dc.typeArticle
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume42
dc.source.issue7-8
dc.source.beginpage1429
dc.source.endpage1439
refterms.dateFOA2021-02-12T22:30:12Z


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