Spectroscopy and physics of atoms and molecules

Analysis and analytical modeling of Air, N$_2$, O$_2$ and CO$_2$ broadening coefficients of water vapor lines in the 380–26000 cm$^{-1}$ spectral range

V. I. Starikov

Tomsk State University of Control Systems and Radioelectronics, 634050 Tomsk, Russia

Abstract: The analysis of the available experimental data on the H$_2$O line broadening coefficients by air, nitrogen, oxygen and carbon dioxide in the spectral range 380–26000 cm$^{-1}$ is carried out. The analysis is based on the application of the analytical model $\gamma(sur)$, which depends on the fitting parameters. $N$ = 4110, $N$ = 757, $N$ = 658 and $N$ = 688 air, nitrogen, oxygen and carbon dioxide broadening coefficients derived from the fitted parameters agree with measurements with an average accuracy of 7.2%, 11.6%, 7.6% and 7.1%, respectively. In a simultaneous analysis of $N$ = 5525 air, nitrogen and oxygen broadening coefficients an average accuracy is 9.2%. The parameters of the analytical model $\gamma(sur)$ may be recommended in the $\gamma$ calculations of H$_2$O lines with rotational quantum numbers $J\le$ 20, $K_a\le$ 15 for any vibrational band from the mentioned spectral range.

Keywords: water vapor, Air, N$_2$,O$_2$ and CO$_2$ broadening coefficients.

Received: 10.01.2022
Revised: 04.04.2022
Accepted: 19.06.2022

DOI: 10.21883/OS.2022.09.53290.3135-22

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