Measurements of air-broadening parameters of water vapour transitions in the 5090–7490 cm<sup>−1</sup> spectral region
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High-resolution spectra of H<sub>2</sub>O with a high signal/noise ratio (2500 at the absorbance equal 1) were recorded with a Bruker IFS 125 FTIR spectrometer covering H<sub>2</sub>O transitions from 5090 to 7490 cm<sup>−1</sup> at the spectral resolution of 0.01 cm<sup>−1</sup>. The multispectrum fitting procedure has been applied to recover the spectral line parameters from measurements using quadratic speed-dependent Voigt (qSDV) profiles which made it possible to describe the experimental profile at the noise level. The H<sub>2</sub><sup>16</sup>O line broadening and shift coefficients for 439 lines of 7 vibrational bands 2ν<sub>3</sub>, ν<sub>2 </sub>+ ν<sub>3</sub>, 2ν<sub>2 </sub>+ ν<sub>3</sub>, ν<sub>1 </sub>+ ν<sub>3</sub>, ν<sub>1 </sub>+ ν<sub>2</sub>, ν<sub>1 </sub>+ 2ν<sub>2</sub> and 2ν<sub>1</sub> were measured. A total of 339 lines were studied for the first time. The uncertainty of the broadening coefficients for the unblended H<sub>2</sub>O absorption lines was 2–4%. The determined parameters are compared to HITRAN12 and experimental values. The ratio between HITRAN data and our broadening coefficient varied from 0.82 to 1.21. The calculations of broadening and shift coefficients were performed in a framework of the semi-classical method and by using an empirical function whose parameters were taken from the literature. The uncertainty of calculations was 5% for the air broadening half-widths on average.
