H2O absorption lines broadened by air pressure were recorded in the 5900–6100-cm−1 spectral region with the use of a Bruker IFS 125 HR spectrometer. The intensities and broadening and shift coefficients of 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 atmospheric transmission is calculated with the use of H2O line parameters from different versions of the HITRAN and GEISA spectroscopic databases and our new data. Model spectra are compared with atmospheric solar spectra measured with a ground-based Fourier spectrometer. It is shown that the use of our new data on H2O absorption line parameters improves the agreement between the model and measured atmospheric spectra.
Atmospheric and Oceanic Optics – Springer Journals
Published: Jul 5, 2021
Keywords: water vapor; Fourier transform spectroscopy; atmospheric transmission; absorption line parameters