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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 2648cm−1 (for 17O/18O) and 4582cm−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...
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