Computer Science
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27..555n&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 27, no. 5, p. 555-559.
Computer Science
6
Cosmochemistry, Meteoritic Composition, Proton Irradiation, Rare Gases, Silicates, Vapor Traps, Adsorption, Interstellar Matter, Mass Spectroscopy, Vapor Deposition
Scientific paper
We have measured Ne, Ar, Kr, and Xe in Si2O3 'smokes' that were condensed on Al substrates, vapor-deposited with various mixtures of CH4, NH3, H2O3 and noble gases at 10 K and subsequently irradiated with 1 MeV protons to simulate conditions during grain mantle formation in interstellar clouds. Neither Ne nor Ar is retained by the samples upon warming to room temperature, but Xe is very efficiently trapped and retained. Kr is somewhat less effectively retained, typically depleted by factors of about 10-20 relative to Xe. Isotopic fractionation favoring the heavy isotopes of Xe and Kr of about 5-10-percent/amu is observed. Correlations between the specific chemistry of the vapor deposition and heavy noble gas retention are most likely the result of competition by the various species for irradiation-produced trapping sites. The concentration of Xe retained by some of these smokes exceeds that observed in phase Q of meteorites and, like phase Q, they do not seem to be carriers of the light noble gases.
Hohenberg Charles M.
Moore Marla H.
Nichols Robert Hill Jr.
Nuth Joseph Andrew III
Olinger Chad T.
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