Computer Science
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..187p&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Feb. 1984, p. 187-192.
Computer Science
2
Abundance, Chemical Analysis, Comets, Dust Collectors, Minerals, Particulate Sampling, Cometary Atmospheres, Data Sampling, Mass Spectroscopy, Olivine, Pyroxenes, Comets, Grains, Dust, Chemistry, Analysis, Minerals, Techniques, Sims, Secondary Ion Mass Spectrometer, Sampling Techniques, Elements, Abundance, Equipment, Diagrams, Composition, Isotopic Ratios, Ions, Comparisons, Experiments, Procedure, Mission Description
Scientific paper
Analysis of a dust sample (e.g. collected during a cometary rendezvous mission) by SIMS (Secondary Ion Mass Spectroscopy) can provide information on elemental abundances (equal to or less than 100 amu), the molecular composition of grain surfaces, and isotopic ratios of selected elements. This can be accomplished with dust covering as little as 0.0001 of the collector surface area. In order to demonstrate these capabilities a special experimental set-up for substrate preparation, dust collection and SIMS analysis of dust under ultra-high vacuum conditions was developed. The comparison of elemental abundance ratios for different olivines and pyroxenes measured with the special SIMS equipment with that measured by an electron microprobe indicated an accuracy for SIMS of the elemental abundance measurements of equal to or less than 30 percent. By varying the energy threshold of secondary ions to be mass-analysed from 0 to 50 eV, it is possible to identify molecular ions in the spectra and to estimate their abundance with respect to elemental ions on the same mass line. The ratios of molecular to elemental ions vary by a factor of 1-25. The concept for a future cometary rendezvous experiment as well as first results of chemical investigation on mineral dust samples obtained are reported.
Bahr D.
Grün Eberhard
Lang Dustin
Pailer Norbert
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