Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arcn.rept..505t&link_type=abstract
Analysis of Returned Comet Nucleus Samples, Proceedings of a Workshop held at Milpitas, California, 16-18 January, 1989. Compil
Other
Free Radicals, Comet Nuclei, Electron Paramagnetic Resonance, Ice, Samples, Irradiation, Thermal Radiation, Organic Compounds, Inorganic Compounds, Comets, Silicates, Cosmic Rays, Ferromagnetic Materials, Radiation Damage, Thermal Stability, Galactic Evolution, Complex Compounds, Molecules
Scientific paper
Electron Spin Resonance (ESR) studies have been carried out on organic and inorganic free radicals generated by gamma-ray and/or UV-irradiation and trapped in ice matrices. It is suggested that the concentration of these free radicals together with their thermal stability can be used as an accurate built-in geothermometer and radiation probe for returned comet nucleus sample studies. ESR studies have also been carried out on paramagnetic (Mn(2+), Ti(3+), and Fe(3+)) and ferromagnetic (ferric oxide and metallic iron) centers known to be present in terrestrial and extraterrestrial samples. The presence or absence of these magnetic centers coupled with their characteristic ESR lineshape can be used to investigate the shock effects, quenching/cooling rate and oxidation-reduction conditions in the formation and subsequent evolution of returned comet nucleus samples.
Kim Soon Sam
Liang Ranty H.
Tsay Fun-Dow
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