Indigenous Polycyclic Aromatic Hydrocarbon Molecules in Circumstellar Graphite Grains

Details Indigenous Polycyclic Aromatic Hydrocarbon Molecules in Circumstellar Graphite Grains Indigenous Polycyclic Aromatic Hydrocarbon Molecules in Circumstellar Graphite Grains

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..229c&link_type=abstract

Lunar and Planetary Science, volume 27, page 229

Physics

3

Dust: Interstellar, Hydrocarbons: Polycyclic Aromatic, Isotopes, Molecules: Organic, Stars

Scientific paper

Exotic carbon isotope ratios observed in some graphite grains extracted from primitive meteorites point to a circumstellar origin. We have used microprobe two-step laser desorption/laser ionization mass spectrometry (micrometer L^2 MS) to analyze individual circumstellar graphite grains for organic matter in the form of polycyclic aromatic hydrocarbons (PAHs). To date, we have studied 124 graphite grains, extracted from the Murchison CM2 (105 grains), Tieschitz H3 (8 grains), Indarch E4 (6 grains), and Acfer 094 (5 grains) meteorites. Approximately 70% of the grains showed appreciable concentrations of PAHs. Molecule specific isotopic analyses show that most of the PAHs are isotopically normal and could have been added to the grains at various stages in their evolution. However, there is a significant number of molecules that are isotopically similar to the parent grains and are hence indigenous to the circumstellar grains themselves.

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