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 Title: HIGH SENSITIVITY CRDS OF CO2 IN THE 1.74 μM TRANSPARENCY WINDOW. A VALIDATION TEST FOR THE SPECTROSCOPIC DATABASES Author(s): Mondelain, Didier Contributor(s): Campargue, Alain; Perevalov, Valery; Kassi, Samir; Karlovets, Ekaterina; Čermák, Peter Subject(s): Rotational structure/frequencies Abstract: The very weak absorption spectrum of natural CO$_{2}$ near 1.74 $\mu$m (5702 - 5879 \wn) is studied at high sensitivity. The investigated region corresponds to a transparency window of very weak opacity which is of particular interest for Venus. Very weak lines with intensity value as low as 10$^{-30}$ cm/molecule at 296 K are detected by Cavity Ring Down Spectroscopy. On the basis of the predictions of effective Hamiltonian models, 1135 lines of six carbon dioxide isotopologues - $^{12}$C$^{16}$O$_{2}$, $^{13}$C$^{16}$O$_{2}$, $^{16}$O$^{12}$C$^{18}$O, $^{16}$O$^{12}$C$^{17}$O, $^{16}$O$^{13}$C$^{18}$O and $^{16}$O$^{13}$C$^{17}$O - were rovibrationnally assigned to 26 bands. The accurate spectroscopic parameters of 16 bands are determined from standard band-by-band analysis (typical rms deviations of the line positions are $8 \times 10$$^{-4}$ \wn). These newly observed bands include perturbed bands, weak hot bands and bands of minor isotopologues (in particular $^{16}$O$^{12}$C$^{18}$O in natural abundance) and provide critical validation tests for the most recent spectroscopic databases. The comparison to the Carbon Dioxide Spectroscopic Databank (CDSD), HITRAN2016 database and recent ab initio line lists will be presented. Deficiencies are evidenced for some weak perpendicular bands of the HITRAN2016 list and identified as due to inaccurate CDSD intensities which were preferred to \textit{ab initio} intensities. New results based on $^{18}$O enriched CO$_{2}$ spectra will also be detailed. Issue Date: 06/19/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100561 DOI: 10.15278/isms.2018.TJ01 Other Identifier(s): TJ01 Date Available in IDEALS: 2018-08-172018-12-12
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