Measurements of O2-broadening and -shifting parameters of water vapor spectral lines in the second hexad region

Oxygen pressure induced broadening and shifting coefficients for water vapor absorption lines in the 8600-9010 cm−1 region have been measured and calculated. The spectra were recorded with a Bruker IFS 125HR spectrometer at a spectral resolution of 0.01 cm−1 for lines with angular moment of the upper states up to 10. Calculations of line broadening and shifting coefficients are performed using a semi-empirical approach. The method is based on the impact theory of broadening, and includes the correction factors whose parameters can be determined by fitting the broadening or shifting coefficients to the experimental data. The comparison of our calculations with the experimental values argues that the semi-empirical method is quite acceptable for the determination of the water vapor absorption line profile parameters.

► Measurements of O2-broadening and shift of H2O spectral lines have been performed. ► New data on H2O line parameters for 8600-9020 cm−1 region have been obtained. ► Our data on broadening and shifting coefficients differ from those in HITRAN. ► Vibrational dependence of broadening coefficient for 3 bands has been found.