Vol. 36, issue 09, article # 7

Abstract:

The validation of H₂O absorption lines parameters in the modern spectroscopic databases such as
HITRAN2016, HITRAN2020, GEISA2020, and W2020 database of H₂O lines is carried out in the visible region 16700–17000 cm^-1. The H₂O transmission spectra were simulated with the spectroscopic databases and compared with laboratory spectra of pure water vapor and H₂O–N₂ mixture (P = 1 atm), recorded using a Fourier spectrometer with light-emitting diodes of high luminance. The parameters of 65 H₂O absorption lines from HITRAN2020 database were corrected on the basis of the measurements. The positions of 32 lines, intensities of 51 lines, and self-broadening coefficients of 10 lines were improved. The ratio of the HITRAN2020 broadening coefficients to the experimental values is close to 1, whereas the air pressure-induced line shift coefficients in the spectroscopic databases are, on average, two times higher than the experimental values, and therefore, our previously obtained experimental values of N₂ pressure-induced line shift coefficients were used to simulate the transmission spectra of H₂O–N₂ mixture.
The difference of the experimental spectra from the spectra calculated with HITRAN2016, HITRAN2020, GEISA2020, and W2020 spectroscopic databases and corrected HITRAN2020cor gives root-mean-square deviations RMS = 1.49E-4, 1.64E-4, 3.96E-4, 3.49E-4, and 1.26E-4 in the case of pure water vapor and RMS = 1.15E-4, 1.1E-4, 2.23E-4, 2.28E-4, and 0.86E-4 for H₂O–N₂ mixture, respectively.
 

Keywords:

absorption spectrum, water vapor, spectroscopic databases, absorption line parameters, transmittance

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