Other
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...54..388m&link_type=abstract
Icarus (ISSN 0019-1035), vol. 54, June 1983, p. 388-405.
Other
150
Chemical Composition, Comets, Ice, Proton Irradiation, Cosmic Rays, Evolution (Development), Gas Mixtures, Infrared Spectra, Oort Cloud, Radiation Effects, Comets, Protons, Irradiation, Mixing, Evolution, Physical Properties, Ice, Experiments, Temperature, Pressure, Parameters, Oort Cloud, Infrared, Wavelengths, Absorption, Analysis, Procedure, Synthesis, Formation, Gas Chromatograph, Volatiles, Hydrocarbons, Residue, Composition, Abundance, Theoretical Studies, Observations
Scientific paper
Cometary ice mixtures are studied in a laboratory experiment designed to simulate the temperature, pressure and radiation environments of the interstellar Oort cloud region, in order to test the hypothesized radiation synthesis mechanism for changing the characteristics of the outer few meters of a comet stored in the Oort cloud for 4.6 billion years. All experiments conducted confirm the synthesis of new molecular species in solid phase mixtures at 20 K. When CH4 is present in the irradiated ice mixture, long chained, voltaile hydrocarbon and CO2 are synthesized together with high molecular weight C compounds present in the room temperature residue. Due to radiation synthesis, about 1 percent of the ice was converted into a nonvolatile residue containing complicated C compounds not present in the blank samples. These results suggest that initial molecular abundances can be altered, and new species created, as a result of radiation synthesis. Irradiated mixtures exhibited thermoluminescence and pressure enhancements during warming, showing the synthesis of reactive species. Outbursts in new comets resulting from similar irradiation-induced exothermic activity would be expected to begin occurring at distances of the order of 100 AU.
A'Hearn Michael F.
Donn Bertram
Khanna Rajesh
Moore Marla H.
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