Article ID Journal Published Year Pages File Type
5428745 Journal of Quantitative Spectroscopy and Radiative Transfer 2013 13 Pages PDF
Abstract

•Broadening and shift coefficients of lines for 9 H2O bands, perturbed by He are measured.•The parameters of the intermolecular potential for H2O-He system are obtained.•Vibrational dependence of intermolecular potential for H2O-He system is shown.

The intermolecular interaction potential, taken as the sum of pair potentials which, in turn, were modeled by the Lennard-Jones potential has been determined by means of nonlinear least squares fitting its parameters to the experimental data on the lines broadening (γ) and shift (δ) coefficients. The data on γ and δ for nine vibration bands ν1, ν3, 2ν2, ν1+ν2, ν2+ν3, 2ν1, ν1+ν3, 2ν2+ν3 and ν1+ν2+ν3 have been obtained from the analysis of the H2O-He absorption spectra, recorded from 3000 to 9000 cm−1 with help of IFS 125HR Fourier spectrometer at room temperature, spectral resolution of 0.01 cm−1 and in wide pressure range of He. Additionally we use literature data for rotational band (∼180 GHz) and ν2 band (1850-2140 cm−1). The vibrational and rotational dependence of the potential parameters as well as the temperature dependence of the calculated lines broadening coefficients have been demonstrated.

Related Topics
Physical Sciences and Engineering Chemistry Spectroscopy
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