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 Title: CAVITY RING-DOWN SPECTROSCOPY OF CO2 NEAR λ = 2.06 μm Author(s): Fleurbaey, Helene Contributor(s): Hodges, Joseph T.; Fleisher, Adam J.; Adkins, Erin M.; Yi, Hongming Subject(s): Intensities, transition moments, cross sections Abstract: The 20013 $\leftarrow$ 00001 rotation-vibration band of \chem{^{12}C^{16}O_2} near 2.06 $\mu$m is widely used for remote sensing of carbon dioxide concentration in the terrestrial atmosphere. The high accuracy target of such applications (0.3 \% for the OCO-2 satellite mission) motivates reducing the uncertainties of relevant line intensities in currently available line lists. To this end, we present transition intensities measured by frequency-stabilized cavity ring-down spectroscopy for 39 transitions of the 2.06 $\mu$m \chem{CO_2} band. The relative combined standard uncertainty of the line intensities is estimated to be $u_r$ = 0.09 \%. To determine the integrated band intensity from these measurements, two approaches were used to model the $J$-dependence of the intensities. The first approach is based on a one-dimensional quantum mechanical model with Herman-Wallis rotation-vibration corrections, whereas in the second approach, we fit a single factor to rescale the intensities derived from the ab initio dipole moment surface (DMS) of Zak et al. [JQSRT 177, 31-42 (2016)]. Although the two approaches yield equally adequate representations of the observed $J$-dependence, we consider the rescaled ab initio DMS intensities to be the more physically general representation of our data. The results will be compared to existing databases and other experiments. Issue Date: 26-Jun-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/107692 Date Available in IDEALS: 2020-06-26
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