Computer Science
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..388..311w&link_type=abstract
Resonance ionization spectroscopy 1996: Eighth international symposium. AIP Conference Proceedings, Volume 388, pp. 311-314 (19
Computer Science
Photoionization Of Atoms And Ions, Atomic Masses, Mass Spectra, Abundances, And Isotopes
Scientific paper
The Refrigerator Enhanced Analyser for Xenon (RELAX), an ultrasensitive resonance ionization time-of-flight mass spectrometer, has been used with a laser microprobe to investigate the isotopic composition of xenon trapped in the martian meteorite ALH84001. The laser microprobe has a spatial resolution of the order of 100μm thus allowing the in situ analysis of individual mineral grains in a polished section when combined with ultrasensitive, low blank sample analysis. We present results showing that the mineral orthopyroxene in ALH84001 contains a trapped xenon component consistent with a martian origin. Additionally, a cosmic ray exposure age of 15Ma for ALH84001 is obtained from spallation derived xenon trapped within an apatite grain.
Gilmour James D.
Turner Gary
Whitby James A.
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