Buckycarbons and fullerenes in interplanetary dust particles based on evidence from a transmission electron miscroscope (TEM) study of vapor condensed carbons with variable C/H ratio

Details Buckycarbons and fullerenes in interplanetary dust particles based on evidence from a transmission electron miscroscope (TEM) study of vapor condensed carbons with variable C/H ratio Buckycarbons and fullerenes in interplanetary dust particles based on evidence from a transmission electron miscroscope (TEM) study of vapor condensed carbons with variable C/H ratio

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1175r&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 175.

Computer Science

1

Interplanetary Dust, Fullerenes, Vapor Phases, Buckminsterfullerene, Carbon Isotopes, Hydrogen, Transmission Electron Microscopy, X Ray Diffraction, Chondrites, Molecular Structure

Scientific paper

Extraterrestrial buckminsterfullerene (C60) was identified in the Allende meteorite and an impact crater on the LDEF satelllite. The X-XANES analyses of interplanetary dust particle (IDP) L2008F4 have not yet found C60. Amorphous and poorly graphitized carbons, PAHs, and rare graphite and hexagonal diamond in IDPs were determined by a range of experimental techniques, including TEM. Following the discovery of C60, fullerene-related carbons such as 'buckyonions', 'bucky(nano)tubes', and polyhedral structures of concentric (002) layers were indentified and the concentric circular, poorly graphitized carbons in the Allende meteorite were reinterpreted as 'buckycarbons'. Similarly, 'buckyonions', 'buckytubes', and loop-in-loop rings that are cross-sections of compound 'buckyonions', also occur in some chondritic IDPs. We note that polycrystalline, or 'ring', selected area electron diffraction patterns for carbon blacks and samples of 'buckycarbons', when using a field limiting aperture larger than the modal size in the sample, show the same broad rings. An identification as poorly graphitized carbons implies that they are the products of prograde thermal metamorphism of hydrocarbons while the information carried by 'buckycarbons' is fundamentally different; they may be vapor phase condensates.

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