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Abstract <p>Results of solving the problem of determining the temperature dependence of the broadening coefficient of water vapor lines by pressure of different buffer gases are presented. The broadening coefficients γ have been calculated for 18 microwave absorption lines of H<sub>2</sub>O molecule broadened by N<sub>2</sub>, O<sub>2</sub>, CO<sub>2</sub>, air, H<sub>2</sub>O, CO<sub>2</sub>, He, Ar, Kr, and Xe pressure in the temperature range 30&#xa0;≤&#xa0;<i>T</i>&#xa0;≤&#xa0;400&#xa0;K. The models of rectilinear, parabolic, and exact trajectories of colliding particles are used. It is shown that the calculated dependence γ(<i>T</i>) for <i>T</i> <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12605_2025_4747_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\( \lesssim \)</EquationSource> <!--OptAtOc2570022Starikov-m1--> </InlineEquation> 100&#xa0;K is determined by the calculation method and model of the trajectories of colliding particles; in the case of broadening by monatomic gases, these results strongly depend on the chosen interaction potential. The results of the work can be useful for spectral calculations required by atmospheric applications.</p>

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Temperature Dependence of Water Vapor Microwave Line Broadening

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. I. Starikov

摘要

Abstract

Results of solving the problem of determining the temperature dependence of the broadening coefficient of water vapor lines by pressure of different buffer gases are presented. The broadening coefficients γ have been calculated for 18 microwave absorption lines of H2O molecule broadened by N2, O2, CO2, air, H2O, CO2, He, Ar, Kr, and Xe pressure in the temperature range 30 ≤ T ≤ 400 K. The models of rectilinear, parabolic, and exact trajectories of colliding particles are used. It is shown that the calculated dependence γ(T) for T \( \lesssim \) 100 K is determined by the calculation method and model of the trajectories of colliding particles; in the case of broadening by monatomic gases, these results strongly depend on the chosen interaction potential. The results of the work can be useful for spectral calculations required by atmospheric applications.