Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.511n&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 511
Computer Science
Atmospheric Heating, Helium Isotopes, Interplanetary Dust, Pulse Heating, Temperature Effects, Ilmenite, Ion Probes, Olivine, Pyroxenes, Solar Wind
Scientific paper
For the past few years we have been studying the amounts and isotopic composition of the He found in individual interplanetary dust particles (IDPs) in the 10-50 microns-diameter range that were collected in the stratosphere. In the initial investigation no attempt was made to determine the temperature at which the gas would be released. In a subsequent study, step-heating was employed to see if the release pattern would provide clues relating to the thermal history of the particles. In a refinement of the procedure, stepped pulse-heating was employed. To date, approximately 100 particles were investigated, most of which entered the Earth's atmosphere as individual particles. The study also included some particles that were fragments of larger parent particles. The amounts of He found varied widely. The fact that variations are seen suggests that not all IDPs have the same origin. With our pulsed step-heating procedure it was possible to verify the presence of two components in lunar grains. A search, in the case of IDPs, was not successful, and will be pursued further. Implantation experiments were performed on grains of ilmenite, pyroxene, and olivine, using beams of ions containing both He-3 and He-4 to see if isotopic separation takes place in the extraction process. In a further study now underway, beams having a large proportion of H2 present are employed to more closely simulate the actual solar wind.
Nier Alfred O.
Schlutter Dennis J.
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