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[Ａ−３.４　Advanced study of the spectroscopic line parameters of trace gases for ILAS-II observation in space]

[Contact person]

[Total Budget for FY1999-2000]

　12,808,000 Yen
　(FY 2000; 6,404,000 Yen)

［Abstract］

　The objective of this study is to determine the accurate absorption line parameters, such as the line position, the line strength, and the half-width, which are required in the data analysis of ILAS-II. The main targets of experiments are the absorption bands of CH₄, N₂O, and CO₂ in the spectral region of CH.2 which is newly installed in ILAS-II. The absorption spectra of CH₄, N₂O, and CO₂ were measured with a high-resolution Fourier transform spectrometer at room temperature. The measurements included several absorption bands: the ν₃ band of CH₄, the 2ν₁, ν₁+2ν₂, and ν₃, bands of N₂O, and the ν₃ band of CO₂. The nonlinear least squares fitting procedure was used to determine the line strengths, N₂- and O₂-broadened half-widths of the above bands. The line strengths and half-widths of CH₄ and N₂O were in good agreement with the latest HITRAN database and the recent high-resolution experiments. N₂- and O₂-broadened half-widths of CO₂ agreed with the high-resolution experiments, whereas the line strengths were close to the HITRAN86 values rather than that of HITRAN96,2K. The coefficient of the Herman-Wallis factor agreed well with both the experiment and theoretical calculation.

［Key Words］

　ILAS-II, Absorption spectrum, Line parameter, Line strength, Half-width