Ground-based IR observation of oxygen isotope ratios in Venus's atmosphere

N. Iwagami, G. L. Hashimoto, S. Ohtsuki, S. Takagi, S. Robert

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Abstract The oxygen isotope ratios 17O/16O and 18O/16O in Venus's atmosphere were measured simultaneously by ground-based IR spectroscopy. The CO2 absorption lines in the 2648 cm-1 (for 17O/18O) and 4582 cm-1 (for 18O/16O) regions were observed using the IRTF/CSHELL spectrometer. The deviations of the isotope fractions are found to be δ17O=+92±158‰ and δ18O=-42±85‰as compared to the terrestrial standard (HITRAN 2012) where the uncertainties include both random and systematic errors. Such combination agrees with the Earth-Moon fractionation line within the errors. This is consistent to the fact that the proto-Venus matter was also well mixed with the proto-Earth-Moon matter.

Original languageEnglish
Article number3830
Pages (from-to)292-297
Number of pages6
JournalPlanetary and Space Science
Publication statusPublished - Aug 1 2015


  • Ground-based
  • IR spectroscopy
  • Oxygen isotope
  • Venus atmosphere

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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