Laboratory simulation of meteoritic noble gases. II - Sorption of xenon on carbon: Etching and heating experiments

Details Laboratory simulation of meteoritic noble gases. II - Sorption of xenon on carbon: Etching and heating experiments Laboratory simulation of meteoritic noble gases. II - Sorption of xenon on carbon: Etching and heating experiments

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1049z&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, April 1985, p. 1049-1059.

Computer Science

7

Carbon, Meteoritic Composition, Sorption, Xenon, Etching, Polyvinyl Chloride, Rare Gases, Trapping, Meteorites, Experiments, Simulations, Rare Gases, Xenon, Carbon, Pores, Entrapment, Isotopes, Procedure, Spectrometry, Adsorption, Diffusion, Comparisons, Models, Time Scale, Implantation, Samples, Meteorite

Scientific paper

The release of trapped Xe from amorphous-C phases of meteorites is simulated experimentally by HNO3 etching of carbon-black and pyrolyzed polyvinylidene chloride samples exposed to Xe-127 for 0.5-240 h at 100-1000 C and then degassed for 9 h or more at the same temperatures, as reported by Wacker et al. (1985). The results are presented in tables and graphs and characterized in detail. Samples exposed at 100-200 C are found to lose most of their Xe after etching to a depth of only about 20 pm, while those exposed at 800-1000 C exhibit a second more tightly bound component extending to a depth of 3 nm, indicative of diffusion of Xe during exposure and resembling planetary Xe. The higher noble-gas concentrations measured in meteorites are attributed to rate-controlled Xe uptake over a long period in the solar nebula.

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