Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusm.v41a..05k&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #V41A-05
Physics
2100 Interplanetary Physics, 2194 Instruments And Techniques, 6200 Planetary Sciences: Solar System Objects, 6297 Instruments And Techniques
Scientific paper
The determination of the oxygen isotopic composition of the sun is the highest priority science objective of the GENESIS mission. We have performed the first oxygen isotopic analyses of the GENESIS solar wind concentrator sample #60001 using the UCLA MegaSIMS instrument. The MegaSIMS is a hybrid secondary ionisation and accelerator multicollector mass spectrometer. The problems of instrumental background, sample surface contamination (both adsorbed and particulate) and detector cross-talk can now be dealt with and we can measure consistently solar wind oxygen depth profiles. Our preliminary oxygen isotope data indicate that the solar wind sample is 16O enriched compared to terrestrial but the details of isotopic fractionation in the concentrator and in the solar wind itself have to be worked out before a value for the sun can be calculated.
Allton Judith
Burnett Donald
Callaway Mark
Coath Christopher D.
Jarzebinski G.
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