Measurements and calculations of H-2-broadening and shift parameters of water vapour transitions of the (1) + (2) + (3) band
The water vapour line broadening and shifting for 97 lines in the v} + v2 + v3 band induced by hydrogen pressure are measured with Bruker IFS 125 HR FTIR spectrometer. The measurements were performed at room temperature, at the spectral resolution of 0.01 cm-1 and in a wide pressure range of H2. The calculations of the broadening у and shift 8 coefficients were performed in the semi-classical method framework with use of an effective vibrationally depended interaction potential. Two potential parameters were optimised to improve the quality of calculations. Good agreements with measured broadening coefficients were achieved. The comparison of calculated broadening coefficients у with the previous measurements is discussed. The analytical expressions that reproduce these coefficients for rotational, v2, vv and v3 vibrational bands are presented.