First Detection Of The 01111-00001 Band Of 12C16O18O In The Venus Atmosphere By Spicav/soir

Details First Detection Of The 01111-00001 Band Of 12C16O18O In The Venus Atmosphere By Spicav/soir First Detection Of The 01111-00001 Band Of 12C16O18O In The Venus Atmosphere By Spicav/soir

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.4503c&link_type=abstract

American Astronomical Society, DPS meeting #39, #45.03; Bulletin of the American Astronomical Society, Vol. 39, p.502

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Absorption lines of an unknown absorber, located around 2982 cm-1, were observed in spectra recorded by SPICAV/SOIR on board Venus Express. Those lines corresponded to nothing catalogued neither in the HITRAN nor in CDSD [1] databases. We will show that they are due to 12C16O18O and correspond to its 01111-00001 absorption band. This band has never been observed before, not even in the laboratory because of its weakness. Line parameters (positions and intensities) are reported for the first time. Theoretical calculations produced the positions of the 12C16O18O lines, but no information on their intensity. However this information can be learned from the SOIR spectra.
CO2 is the main component of the Venus atmosphere, where it represents 96.5 % of its composition. Its isotopic abundances have been determined using either earth-based near-infrared spectroscopy or in situ mass spectrometers. From those measurements it was found that the 13C/12C and 18O/16O ratios were very similar to those on Earth. Measurement of different isopotologues of CO2 using the SPICAV/SOIR instrument is also possible as the investigated spectral region spans from 2200 to 4500 cm-1, which encompass several absorption bands, for which the line parameters are reported in the CDSD database.
References
1. Tashkun, S., et al., CDSD-1000, the high-temperature carbon dioxide spectroscopic databank, JQSRT, 82, 165-196, 2003.

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