WATER VAPOR ABSORPTION IN ATMOSPHERIC WINDOWS IN THE MILLIMETER WAVE RANGE

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1993

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Ohio State University

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Laboratory experiments using a Fabry Perot interferometer have allowed the determination of the water vapor absorption coefficient at different frequencies in the gaps between rotational lines in the millimeter wave range. The magnitude of absorption, its pressure and temperature dependence for pure $H_{2}O$ and atmospheric $H_{2}O-N_{2}$ mixing cannot be reproduced by models involving conventional lineshapes. An additional absorption has to be considered, and different semi empirical or empirical models involving a continuum are compared to the experimental data. In particular, a comparison is made for two frequencies symmetric with respect to the 183 GHz line center.

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Author Institution: Laboratoire de Spectroscopie Hertzienne, Universit\'{e} de Lille

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