Carbon-dioxide pressure broadening of water vapor absorption line on the region of ν_1+ν_2+ν3 vibrational band
Petrova T.M.
1, Solodov A.M.
1, Solodov A.A.
1, Deichuli V.M.
1, Dudaryonok A.S.
1, Lavrentieva N.N.
11V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences,Tomsk, Russia
Email: tanja@iao.ru, dudaryon@iao.ru, lnn@iao.ru
The water-vapor line profile parameters are necessary to study the planetary atmospheres where the carbon dioxide is the main gas. H2O absorption lines broadened by the carbon dioxide were recorded using the IFS 125 HR Fourier spectrometer in the range of 8830-9000 cm-1. A modified speed-dependent Voigt profile taking into account the dependence of broadening on the relative speed of the colliding molecules was used to approximate the lines. For the first time the parameters of the H2O absorption lines in the ν_1+ν_2+ν3, 2ν_1+ν2, 6ν2, ν_1+3ν2 and 3ν_2+ν3 vibrational-rotational bands were determined. The calculations of the broadening coefficients were carried out using a semi-empirical method which uses a correction factor depending on the quantum numbers. The computed room-temperature broadening coefficients of water vapor lines induced by carbon-dioxide pressure are presented; the rotational quantum number of angular momentum J varies from 0 to 9. Keywords: Water vapor, Martian atmosphere, Venusian atmosphere, line broadening, H2O-CO2.
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