Measurements and modeling of absorption by CO 2 + H 2 O mixtures in the spectral region beyond the CO 2 ν 3 -band head

International audienceIn this work, we measured the absorption by CO 2 + H 2 O mixtures from 2400 to 2600 cm −1 which corresponds to the spectral region beyond the ν 3 band head of CO 2. Transmission spectra of CO 2 mixed with water vapor were recorded with a high-resolution Fourier-transform spectrometer for various pressure, temperature and concentration conditions. The continuum absorption by CO 2 due to the presence of water vapor was determined by subtracting from measured spectra the contribution of local lines of both species, that of the continuum of pure CO 2 as well as of the self-and CO 2-continua of water vapor induced by the H 2 O-H 2 O and H 2 O-CO 2 interactions. The obtained results are in very good agreement with the unique previous measurement (in a narrower spectral range). They confirm that the H 2 O-continuum of CO 2 is significantly larger than that observed for pure CO 2. This continuum thus must be taken into account in radiative transfer calculations for media involving CO 2 + H 2 O mixture. An empirical model, using sub-Lorentzian line shapes based on some temperature-dependent correction factors χ is proposed which enables an accurate description of the experimental results

Reflection spectroscopy study of the <SUP>16</SUP>O<SUP>12</SUP>C<SUP>16</SUP>O ν<SUB>3</SUB>-band lines

International audienceReflection spectra of pure CO2 gas have been recorded in the 4.3 μ m region by using a high resolution Fourier transform spectrometer, providing measured values of the refractive index. Comparisons with the results of calculations using available spectroscopic data, and free of any adjusted line parameter, show a very good agreement. This confirms that this experimental technique provides an alternative approach for the test or determination of spectroscopic parameters. Its advantages for studies of extremely strongly absorbing species and investigations of spatially (tightly) confined molecular gases are discussed

Pressure broadening and shift coefficients in the ν1 and ν3 bands of NH3

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Absolute line intensities and first measurements of self-collisional broadening and shift coefficients in the 2ν4 band of NH3

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Measured and calculated O2-broadening coefficients of C2H4 in the 1800–2350 cm-1 spectral region

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He-broadening coefficients and line intensitiesin the 2ν1 band of carbonyl sulfide (OCS)

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Spectroscopic line parameters in the 4ν2 band of NH3 and line intensities in the ν1, ν3 and 2ν4 bands

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Integrated band intensities and absorption cross sections of phosgene (Cl2CO) in the mid-infrared at 199, 250 and 300 K

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Line-by-line intensity measurements of methyl fluoride in the ν2 and ν5 bands

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