Measurements and calculations of broadening and shift coefficients of water vapor lines perturbed by air and nitrous oxide in the 2ν1 + ν2 + ν3 band
L.N. Sinitsa, S.S. Vasilchenko, T.A. Nevzorova, A.S. Dudaryonok, N.N. Lavrentieva
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: line profile parameters, line broadening, halfwidth, line shift, water vapor, nitrous oxide
Abstract
The study of the absorption of water vapor, the most powerful greenhouse gas, is important for the development of climate models of our planet. The broadening of spectral lines become of special importance for variations in temperature and pressure in the atmosphere. The paper presents the measured broadening and shift coefficients of H2O lines by N2O and air pressure at room temperature for 11 vibrational-rotational transitions in the 2ν1 + ν2 + ν3 band, the rotational quantum number J varies from 0 to 6. The measurements were carried out on a CRDS spectrometer of high sensitivity (6.5 × 10-11 cm-1), the apparatus function of which is orders of magnitude narrower than the width of the lines under study. Line broadening and shift coefficients were also calculated using the semi-classical approach modification, where a correction factor is included in the calculation scheme. The obtained parameters were compared with published data. The results can be used for refining spectroscopic information in HITRAN database.
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