Investigation of radiation enhanced diffusion of magnesium in substrates flown on the NASA genesis mission

Investigation of radiation enhanced diffusion of magnesium in substrates flown on the NASA genesis mission

The thermal diffusion of an Mg implant in Si has been measured with SIMS and compared to RIMS (resonant ionisation mass spectrometry) measurements of Mg implantation and diffusion in Si wafers exposed to solar wind irradiation in the NASA Genesis mission. The Genesis samples show much more surface s...

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Veröffentlicht in:Appl. Surf. Sci 2008-12, Vol.255 (4), p.1455-1457
Hauptverfasser: King, B.V., Pellin, M.J., Burnett, D.S.
Format: Artikel
Sprache:eng
Schlagworte:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DIFFERENTIAL EQUATIONS
DIFFUSION
Genesis
INTERSTITIALS
IRRADIATION
MAGNESIUM
MASS SPECTROSCOPY
NASA
ORIGIN
RADIATIONS
RIMS
SEGREGATION
Silicon
SIMS
SOLAR WIND
SUBSTRATES
THERMAL DIFFUSION
TRANSPORT
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Beschreibung
Zusammenfassung:The thermal diffusion of an Mg implant in Si has been measured with SIMS and compared to RIMS (resonant ionisation mass spectrometry) measurements of Mg implantation and diffusion in Si wafers exposed to solar wind irradiation in the NASA Genesis mission. The Genesis samples show much more surface segregation that the samples annealed in the laboratory, due to diffusion and segregation of the implanted Mg to the heavily damaged near surface regions of the Genesis wafers. This Mg transport has been modeled by solving a set of stiff differential equations and found to agree with RIMS measurements for a Mg interstitial migration energy of 0.7 eV.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2008.05.158