Broadening and shift coefficients of H2O absorption lines induced by CO2 pressure in the 2.7 mm spectral region
V.M. Deichuli, T.M. Petrova, A.A. Solodov, A.M. Solodov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: water molecule, broadening and shift coefficients, Fourier spectroscopy, carbon dioxide
Abstract
The H2O absorption lines broadened by the carbon dioxide pressure were recorded using IFS 125 HR Fourier spectrometer in the spectral region of 3760-4160 cm-1. The values of the broadening and shift coefficients of the H2O absorption lines are determined for the Voigt profile and the modified Voigt profile which takes into account the dependence of the broadening on the speed of the colliding molecules. The parameters of the H2O absorption lines obtained in the work allow more accurate determination of the H2O concentration in the carbon dioxide atmospheres of the planets, as well as more accurate calculation of these parameters for other spectral regions.
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