Pressure broadening coefficients of the water vapor lines at 556.936 and 752.033 GHz

The air induced broadening coefficients of the pure rotational transitions of H2O at 556.936 GHz (110←101), and 752.033 GHz (211←202) were measured by terahertz time-domain spectroscopy. The air broadening coefficient was determined to be for the 556.936 GHz line and for the 752.033 GHz line, respec...

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Published inAdvances in space research Vol. 109; no. 1; p. 144
Main Authors Seta, Takamasa, Hoshina, Hiromichi, Kasai, Yasuko, Hosako, Iwao, Otani, Chiko, Lossow, Stefan, Urban, Joachim, Ekström, Mattias, Eriksson, Patrick, Murtagh, Donal
Format Journal Article
LanguageEnglish
Published 2008
Subjects
Odin/SMR
Pressure broadening
Submillimeter
Terahertz time-domain spectroscopy
Water vapor
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Summary:The air induced broadening coefficients of the pure rotational transitions of H2O at 556.936 GHz (110←101), and 752.033 GHz (211←202) were measured by terahertz time-domain spectroscopy. The air broadening coefficient was determined to be for the 556.936 GHz line and for the 752.033 GHz line, respectively. The present broadening coefficients for the 556.936 GHz water line are significantly smaller than those of Markov and Krupnov [Measurements of the pressure shift of the 1(10)–1(01) water line at 556.936 GHz produced by mixtures of gases. J Mol Spect 1995:172;211–4] but relatively close to the values of the HITRAN database. The measured data may improve the accuracy of the abundance of water vapor retrieved from spectra obtained by the Odin/SMR satellite instrument. The effect on the satellite retrieval processing is discussed.
ISSN:0273-1177