Weak water absorption lines around 1.455 and 1.66 μm by CW-CRDS |
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Authors: | Semen N. Mikhailenko Wang Le Samir Kassi |
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Affiliation: | a Laboratory of Theoretical Spectroscopy, Institute of Atmospheric Optics, SB, Russian Academy of Science, 1, Akademicheskii av., 634055 Tomsk, Russia b Laboratoire de Spectrométrie Physique (associated with CNRS, UMR 5588), Université Joseph Fourier de Grenoble, B.P. 87, 38402 Saint-Martin-d’Hères Cedex, France c Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | The absorption spectra of water vapor near 1.455 and 1.66 μm have been recorded with a typical absorption sensitivity of 5 × 10−10 cm−1 by using CW-cavity ring down spectroscopy. A series of 18 distributed feed-back (DFB) lasers was used as sources and allowed for the coverage of the 5911.0-5922.5, 5926-5941.8, 5957.0-6121.6, and 6745-7015.6 cm−1 spectral regions. These regions extend to lower and higher energies our previous study of the water spectrum in the important 1.5 μm transparency window [P. Macko, D. Romanini, S.N. Mikhailenko, O.V. Naumenko, S. Kassi, A. Jenouvrier, Vl.G. Tyuterev, J. Mol. Spectrosc. 227 (2004) 90-108]. The line parameters were determined with the help of an interactive least squares multi-lines fitting program which uses a Voigt function as line profile. More than 1900 water lines with intensities ranging between 10−28 and 5 × 10−24 cm/molecule at 296 K were measured, about 690 of them being reported for the first time. The rovibrational assignment was performed on the basis of previously determined energy levels and of the results of the variational global calculations [H. Partridge, D.W. Schwenke, J. Chem. Phys. 106 (1997) 4618-4639]. The assignment results were validated by using the Ritz combination principle together with previously reported water transitions. Several new energy levels were determined for the H216O, H217O, and HD16O isotopologues. The retrieved line lists of the H216O, H217O, H218O, and HD16O isotopologues are compared with the available calculated and experimental (FTS) databases for water. |
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Keywords: | Cavity ring down spectroscopy Water molecule H216O H217O HD16O H218O Rovibrational assignments |
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