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.
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 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
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.