Details

Autor(en) / Beteiligte

• Petrova, T. M.
• Solodov, A. M.
• Solodov, A. A.
• Deichuli, V. M.
• Starikov, V. I.

Titel

Measurements and calculations of air-broadening and shift parameters of water vapour transitions in a wide spectral region

Ist Teil von

• Molecular physics, 2021-05, Vol.119 (10), p.e1906967

Ort / Verlag

Abingdon: Taylor & Francis

Erscheinungsjahr

2021

Quelle

Taylor & Francis

Beschreibungen/Notizen

• The water vapour line broadening (γ) and shifting (δ) coefficients for 212 lines of eight vibrational bands, namely, ν 2  + ν 3 , 2ν 2  + ν 3 , 3ν 2  + ν 3 -ν 2 , 4ν 2 , ν 1  + ν 3 , ν 1  + ν 2 , ν 1  + 2ν 2 and 2ν 1 , in the 5800-6700 cm -1 spectral region induced by air are measured using Fourier transform infrared spectroscopy. The measurements are performed with a spectral resolution of 0.01 cm -1 and in a wide pressure range of air. The calculations of δ are based on the Anderson-Tsao-Curnutte theory. The measured γ values are combined with literature data for the half-widths found for the lines in the 380-14,000 cm -1 spectral region. The combined experimental data for N = 1386 measured γ coefficients of 17 vibrational bands of the H 2 O molecule perturbed by air are fitted to an empirical function. Two fitting procedures are used, with one considering the fit of the measured γ for individual rotational branches and the other considering the global fit of all 1386 measured γ. The computed γ values derived from the fitted parameters are compared statistically to the measurements. The vibrational dependence of the measured γ and their compatibility are discussed. The obtained fitted parameters of the empirical function are used for the analysis of γ for the lines in the 13,000 to 26,000 cm -1 spectral region.