Helium broadening parameters of water vapor in the 10,200–11,200 cm−1 spectral region

Abstract

The He-broadening (γ) and shift (δ) coefficients of 76 rovibrational transitions belonging to the 3ν1, 3ν3, ν1+2ν2+ν3, and 2ν1+ν3 vibrational bands of H2O molecule were measured in the spectral range between 10,200 and 11,200cm−1 with the spectral resolution of 0.01cm−1 using a Bruker IFS 125HR FTIR spectrometer. The calculations of γ and δ were performed in the framework of the semi-classical method. It was shown that the vibrational dependence of the long-range as well as the short-range parts of an isotropic H2O-He interaction potential influencesubstantially the calculated broadening coefficients γ. The vibrationally and rotationally dependent analytical model for the broadening coefficients calculation is presented and discussed.