Computer Science
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..388..215h&link_type=abstract
Resonance ionization spectroscopy 1996: Eighth international symposium. AIP Conference Proceedings, Volume 388, pp. 215-218 (19
Computer Science
Photoionization Of Atoms And Ions, Atomic Masses, Mass Spectra, Abundances, And Isotopes, Solar Wind Plasma, Sources Of Solar Wind
Scientific paper
It has been proposed that the composition of the solar wind could be measured directly by transporting ultrapure collectors into space, exposing them to the solar wind, and returning them to earth for analysis. In a study to help assess the applicability of present and future postionization secondary neutral mass spectrometers for measuring solar wind implanted samples, measurements of Zr in Si were performed. A three-color resonant ionization scheme proved to be efficient while producing a background count rate limited by secondary ion signal (5×10-4 counts/laser pulse). This lowered the detection limit for these measurements to below 500 ppt for 450,000 averages. Unexpectedly, the Zr concentration in the Si was measured to be over 4 ppb, well above the detection limit of the analysis. This high concentration is thought to result from contamination during sample preparation, since a series of tests were performed that rule out memory effects during the analysis.
Burnett Don S.
Calaway W. F.
Hansen Shelley C.
Pellin Michael J.
Wiens Roger C.
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