The absorption spectra of the mixtures of water vapor and air at different partial pressures of both gases have been recorded using a Fourier spectrometer IFS 125 HR in the 3500−5670 cm–1 spectral region. The multispectrum fitting procedure has been applied to these spectra to recover the spectral line parameters. The traditional Voigt and quadratic speed-dependent Voigt ones were used. Particular attention was paid to the analysis of the broadening and shift coefficients of the H2O absorption lines. The significant difference between the obtained and literary data was shown. The atmospheric transmission was simulated with the H2O absorption lines from the HITRAN and GEISA spectroscopic databases and with new lines parameters obtained in this work.
In the region of 5100 – 5400 cm-1, the absorption lines of the HD16O molecule broadened by the CO2 pressure were registered on the Fourier spectrometer IFS 125 HR. The parameters of HDO absorption lines belonging to two vibration-rotational bands, ν2+ν3 and ν1+ν2, are determined. The measurements were carried out at room temperature with a spectral resolution of 0.01 cm–1. The absorption lines were approximated using a modified Voigt profile, which takes into account the dependence of broadening on the velocities of colliding molecules.
The parameters of the 190 H2O absorption lines broadened by the carbon dioxide pressure were determined for the vibration-rotational bands ν1+ν3, 2ν2+ν3, and 2ν1 in the 6760–7430 cm–1 spectral region. The measurements were carried out on a Bruker HR 125 Fourier spectrometer at room temperature with a spectral resolution of 0.01 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 will allow more accurate determination of the H2O concentration in the carbon dioxide atmospheres of the planets.
The H2O absorption lines broadened by air pressure were recorded using Bruker IFS 125 HR Fourier spectrometer in the 5900-6100 cm–1 spectral region. The intensities, broadening and shift coefficients of H2O absorption lines were retrieved for lineshape profile taking into account a dependence of the broadening on collision molecules speed. The atmospheric transmission was calculated with use of H2O line parameters from the HITRAN spectroscopic database and our data. A comparison with the atmospheric solar spectra measured using a ground-based Fourier spectrometer was carried out.
Air pressure induced broadening and shift coefficients for methane absorption lines in the 6000–6100 cm–1 region have been measured. The spectra were recorded using Bruker IFS 125 HR spectrometer at room temperature, at the spectral resolution of 0.01 and 0.007 cm–1 and in a wide pressure range of air. The multispectrum fittings with the quadratic speed dependent Voigt profile were performed to retrieve the broadening parameters for CH4 spectral lines. The atmospheric transmission of CH4 calculated by line-by-line method with use of absorption lines parameters from different spectroscopic databases and data obtained in this work was compared.
The water vapor line broadening and shift coefficients of H2O absorption lines induced by hydrogen pressure were measured using a Bruker IFS 125HR spectrometer.
The water vapor line broadening and shift coefficients in the ν1+ν2+ν3, 3ν2+ν3 and 2ν1+ν2 vibrational bands of H2O induced by hydrogen pressure were measured using a Bruker IFS 125HR spectrometer. These vibrational bands were investigated for the first time. The values of the broadening and shift coefficients were compared with the experimental data obtained for H2O–He and H2O–Ar optical systems
For the first time the absorption spectrum of 2 0 0 12 – 0 0 0 01 band of carbon dioxide, confined in nanoporous silica aerogel with the density of 0.009 g/cm3,was measured using a Bruker IFS 125 HR FTIR at room temperature and a spectral resolution of 0.008 cm-1. The obtained dependence of spectral line half-width values on rotational quantum numbers was studied and compared with data available in the literature.
The absorption spectrum of 2 0 0 12 – 0 0 0 01 band of carbon dioxide, confined in 20 nm nanopores of silica aerogel, was measured with help of a Bruker IFS 125 HR Fourier transform spectrometer at room temperature and a spectral resolution of 0.01 cm-1. The obtained dependence of spectral line half-width values on rotational quantum numbers was studied and compared with data available in the literature.
The water vapor line broadening and shift coefficients in the ν1+ν2, ν2+ν3, ν1+ν3, 2ν3, 2ν1, 2ν2+ν3, and ν1+2ν2 vibrational bands induced by helium pressure were measured using a Bruker IFS 125HR spectrometer. The vibrational bands 2ν3 and ν1+2ν2 were investigated for the first time. The interaction potential used in the calculations of broadening and shift coefficients was chosen as the sum of pair potentials, which were modeled by the Lennard-Jones (6-12) potentials. The vibrational and rotational contributions to this potential were obtained by use of the intermolecular potential parameters and intramolecular parameters of H2O molecule. The calculated values of the broadening and shift coefficients were compared with the experimental data.
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