Helium ion implantation into minerals

Details Helium ion implantation into minerals Helium ion implantation into minerals

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.101...63f&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 101, no. 1, Nov. 1990, p. 63-67.

Computer Science

15

Helium Ions, Ion Implantation, Mineralogy, Decomposition, Earth Atmosphere, Interplanetary Dust, Ion Beams, Solar Wind, Trapped Particles

Scientific paper

Rock-forming minerals (olivine, magnetite, ilmenite, and rutile) were implanted with a 3.6-keV He ion beam, which simulates solar wind alpha particles, and analyzed for implanted He. A total fusion experiment shows that nearly 100 percent of impinging He ions is trapped in a target at smaller doses, while the concentration of trapped helium tends to be saturated above a He ion dose of about 10 to the 16th ions/sq cm. There is no appreciable difference in the concentration of trapped He among minerals. A stepwise heating experiment shows that implanted He is retained more firmly in magnetite and rutile than in olivine. On the basis of the experimental results, a high degree of loss of implanted He out of IDPs is suggested. This may be attributed to decomposition of He-bearing minerals in IDPs during their entry into the earth's atmosphere.

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