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 Title: COMB-ASSISTED CAVITY RING DOWN SPECTROSCOPY OF 17O ENRICHED WATER BETWEEN 7443 AND 7921 CM−1 Author(s): Campargue, Alain Contributor(s): Kassi, Samir; Béguier, Serge; Konefal, Magdalena; Karlovets, Ekaterina; Mikhailenko, Semen; Mondelain, Didier Subject(s): Small molecules Abstract: The room temperature absorption spectrum of water vapour highly enriched in chem{^{17}O} has been recorded by Cavity Ring Down Spectroscopy (CRDS) between 7443 and 7921 wn. Three series of recordings were performed with pressure values around 0.1, 1 and 10 Torr. The frequency calibration of the present spectra benefited of the combination of the CRDS spectrometer to a self-referenced frequency comb. The resulting CRD spectrometer combines excellent frequency accuracy over a broad spectral region with a high sensitivity (Noise Equivalent Absorption, $alpha_{min}sim10^{-11}-10^{-10}$ wn). _x000d_ The investigated spectral region corresponds to the high energy range of the first hexade. The assignments were performed using known experimental energy levels as well as calculated line lists based on the results of Partridge and Schwenke. Overall about 4150 lines were measured and assigned to 4670 transitions of six water isotopologues (chem{H_2^{16}O}, chem{H_2^{17}O}, chem{H_2^{18}O}, chem{HD^{16}O}, chem{HD^{17}O} and chem{HD^{18}O}). Their intensities span six orders of magnitude from 10$^{-28}$ to 10$^{-22}$ cm/molecule. Most of the new results concern the chem{H_2^{17}O} and chem{HD^{17}O} isotopologues for which about 1600 and 400 transitions were assigned leading to the determination of 329 and 207 new energy levels, respectively. For comparison only about 300 and four transitions of chem{H_2^{17}O} and chem{HD^{17}O} were previously known in the region, respectively._x000d_ By comparison to highly accurate chem{H_2^{16}O} line positions available in the literature, the average accuracy on our line centers is checked to be on the order of 3 MHz (10$^{-4}$ wn) or better for unblended lines. This small uncertainty represents a significant improvement of the line center determination of many chem{H_2^{16}O} lines in the considered region. Issue Date: 6/19/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/97111 DOI: 10.15278/isms.2017.MH05 Date Available in IDEALS: 2017-07-27
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