Nature and origin of interstellar diamond from the Allende CV3 meteorite

Details Nature and origin of interstellar diamond from the Allende CV3 meteorite Nature and origin of interstellar diamond from the Allende CV3 meteorite

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3061..323b&link_type=abstract

In its Carbon in the Galaxy: Studies from Earth and Space p 323-324 (SEE N90-27562 21-88)

Computer Science

Allende Meteorite, Carbon, Chemical Analysis, Chondrites, Collisions, Diamonds, Drop Size, Electron Microscopy, Electron Spectroscopy, Ethyl Alcohol, Fragments, Interstellar Matter, Powder (Particles), Substrates, Supernovae, Diamond Films, Dispersing, Electron Diffraction, Electron Energy, Electron Microscopes, Energy Dissipation, Fluorescence, High Pressure, Impurities, Irradiation, Light Elements, Microanalysis, Nitrogen, Oxygen, Scanners, X Ray Sources

Scientific paper

Data and experimental evidence which support the contention that the C delta diamonds may result from grain-grain collisions in supernova shocks in the interstellar medium are presented. Fragments of the Allende CV3 chondrite were acid-treated. A whitish powder was obtained. For the Analytical Electron Microscopy (AEM) a small drop of ethanol suspension was transferred onto holey carbon support films on 3 mm EM grids. The AEM was performed on transmission-thin fragments of the material which overlay holes in the film, to eliminate interference from the substrate. Electron Spectroscopy for Chemical Analysis (ESCA) was performed on a large aliquot of C. Diamond was identified by selected area electron diffraction. Scanning Transmission Electron Microscope / Energy Dispersive X-ray (STEM-EDS) microanalyses of the C delta diamond, using a light-element detector, show that oxygen and possibly nitrogen are the only impurities consistently present. ESCA spectra from bulk C delta material confirm the presence of N at a level of 0.35 percent or less. Under UV irradiation a yellow-red fluorescence is observed, consistent with that of natural diamonds containing substitutional N. Electron Energy Loss Spectra (EELS) were recorded at 2 eV resolution from the C delta diamond, high pressure synthetic diamond, a diamond film produced in a low pressure plasma by chemical vapor deposition (CVD) on a heated silicon substrate (Roy, 1987), graphite, and amorphous arc sputtered carbon. Comparison of the carbon K edge shape and fine structure shows the Allende C delta phase to be largely diamond, but with a significant pre-edge absorption feature indicative of transitions of C 1s electrons into pi asterisk orbitals which are absent in the purely sp(3)-bonded diamond but present in graphite and amorphous carbon.

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