Fourier transform spectroscopy of CO2 isotopologues at 1.6 µm: Line positions and intensities

- Fourier transform spectra of 17O enriched carbon dioxide are recorded at 1.6 µm.
- Line parameters of 20 bands belonging to 5 isotopologues of CO2 are determined.
- Measured line parameters for 4 isotopologues are in a good agreement with CRDS data.
- Line intensities for 17O12C18O are 10% higher than those from CRDS measurements.

The line positions and intensities of carbon dioxide isotopologues have been retrieved between 5900 and 6400 cm−1 region from Fourier transform spectra of 17O- and 18O-enriched carbon dioxide recorded in LADIR (Paris, France) with the Bruker IFS 125-HR. In total 1634 line positions and intensities of 20 bands of the 5 major CO2 isotopologues present in our sample 16O12C17O (39.48%), 17O12C17O (27.73%), 16O12C16O (15.20%), 16O12C18O (7.32%) and 17O12C18O (8.25%) are retrieved. All studied bands belong to the ΔP=8 (only for asymmetric species) and 9 series of transitions, where P=2V1+V2+3V3 is the polyad number (Vi are vibrational quantum numbers). The accuracy of the line position determination is about 0.3×10−3 cm−1 for the unblended and not very weak lines and the accuracy for the line intensities varies from 4% to 30% depending on the intensity of the line and on the extent of the line overlapping. For the 16O12C17O, 17O12C17O, 16O12C18O and 17O12C18O isotopologues the systematic comparisons have been performed with the recent CRDS measurements.