Stable Isotope Analysis of Diatomic Oxygen from SNC Meteorites

Details Stable Isotope Analysis of Diatomic Oxygen from SNC Meteorites Stable Isotope Analysis of Diatomic Oxygen from SNC Meteorites

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1097r&link_type=abstract

Lunar and Planetary Science, volume 27, page 1097

Physics

Laser Extraction, Mars: Oxygen Isotopes, Meteorites: Martian, Meteorites: Snc, Oxygen Isotopes

Scientific paper

Laser-fluorination techniques are presently being used to extract oxygen from silicates and oxides for stable isotope analysis. Target samples are reacted with a fluorinating agent (i.e.,BrF5) in the presence of laser irradiation (10.6mm) to produce O2(g), which is generally converted to CO2 for isotopic analylsis. While the O2-CO2 conversion is routinely used in the preparation of terrestrial materials, it is not used for extraterrestrial samples because the conversion produces 13C 16 O 16 O of nominal mass (45), which is an isobaric interference for the 12C 17 O 16 O molecule. In addition, the conversion process is known to fractionate samples less than about one milligram in size, so only relatively large samples are analyzed. Since present-day isotope ratio mass spectrometers (IRMS) are capable of measuring samples two orders of magnitude smaller in size (e.g. microgram) a more effective method of analysis is warranted.

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