Fourier transform measurements of water vapor line parameters in the 4200-6600 cm region |
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Authors: | Alain Jenouvrier Ludovic Daumont Vladimir G Tyuterev Ann Carine Vandaele Sophie Fally |
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Institution: | a Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 6089, UFR Sciences, Moulin de la Housse, B.P. 1039, 51067 Reims Cedex 2, France b Service de Chimie Quantique et de Photophysique ,CP 160/09, Université Libre de Bruxelles, 50 Av. F.D. Roosevelt, B-1050 Brussels, Belgium c Institut d’ Aéronomie Spatiale de Belgique, Av. Circulaire 3, B-1180 Brussels, Belgium d Laboratory of Theoretical Spectroscopy, Institute of Atmospheric Optics, Russian Academy of Sciences, 1, Av. Akademichesskii, 634055 Tomsk, Russia |
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Abstract: | New high-resolution water vapor absorption spectra were obtained at room temperature in the 4200-6600 cm−1 spectral region by combining Fourier transform spectrometers (FTS) with single and multiple reflection cells. With absorption paths from 0.3 to 1800 m in pure and air diluted water vapor, accurate measurements of about 10400 lines in an intensity range from 10−29 to 10−19 cm/molecule have been performed. Positions, intensities, self- and air-broadening coefficients and air-induced shifts were determined for the H216O, H217O, H218O and HDO isotopologues. The rovibrational assignment of the observed lines was performed with the use of global variational predictions and allowed the identification of several new energy levels. One major contribution of this work consists of the identification of 3280 new weak lines. A very close agreement between the new measured parameters and those listed in the database is reported as well as between the observations and the most recent variational calculations for the positions and the intensities. The present parameters provide an extended and homogeneous data set for water vapor, which is shown to significantly improve the databases for atmospheric applications, especially in the transmission windows on both sides of the band centered at 5400 cm−1. |
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Keywords: | Water vapor Line intensity Broadening Atmospheric absorption Fourier transform spectroscopy |
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