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| Home > External Publications > Vita Publications > Quantitative organic and light-element analysis of comet 81P/Wild 2 particles using C-, N-, and O-μ-XANES |
| Home > External Publications > Vita Publications > Quantitative organic and light-element analysis of comet 81P/Wild 2 particles using C-, N-, and O-μ-XANES |
| Journal Article | PUBDB-2016-00367 |
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2008
Wiley-Blackwell
Hoboken, NJ
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Please use a persistent id in citations: doi:10.1111/j.1945-5100.2008.tb00627.x
Abstract: Synchrotron-based soft X-ray micro-analysis was performed on particles extracted fromthe Stardust aerogel collector in order to obtain detailed organic functional group information on anyorganic solids captured as part of the Principal Examination suite of analyses for samples from comet81P/Wild 2. It is observed that cometary organic carbon captured in aerogel is present in a number ofdifferent manifestations and often intimately associated with silicates. Carbon X-ray absorption nearedge structure (XANES) spectra reveal considerable chemical complexity in all of the organicparticles studied so far. Universally, the comet 81P/Wild 2 organic particles contain lowconcentrations of aromatic and/or olefinic carbon relative to aliphatic and heteroatom-containingfunctional groups, e.g., amide, carboxyl, and alcohol/ethers. N-XANES confirms the presence andassignments of these functional groups. In general, the XANES data record considerable chemicalcomplexity across the range of organic samples currently analyzed. The atomic ratios, N/C and O/C,derived from XANES data reveal a wide range in heteroatom content; in all cases these elementalratios are higher than that of primitive meteoritic organic matter. The wide range in chemistry, bothin elemental abundances and specific organic functional groups, suggests that the comet 81P/Wild 2organic solids may have multiple origins.
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