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Vol. 31, issue 05, article # 2

Bogdanova Yu. V., Rodimova O. B. Water dimer – water monomer absorption relation within the H2O rotational band. // Optika Atmosfery i Okeana. 2018. V. 31. No. 05. P. 341–348. DOI: 10.15372/AOO20180502 [in Russian].
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Abstract:

Spectral line contour found on the basis of the asymptotic line wing theory with parameters obtained from fitting to experiment in the 8–12 μm region and describing the spectral and temperature behavior of the water vapor absorption coefficient in this region is used to calculate absorption in the long-wave wing of the H2O rotational band. The absorption coefficient calculated within the asymptotic line wing theory takes into account the absorption by any colliding molecular pairs except the absorption due to stable dimers. The application of this contour in calculation of the absorption coefficient in the range of 14–200 cm-1 allows us to extract the absorption part due to stable dimers from the absorption measured with the special resonator spectrometer. The dimer absorption spectrum derived shows a consistency with the spectra from quantum-mechanical calculations and measured in other experiments.

Keywords:

water vapor, water dimers, spectral line wings, microwave absorption

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