Vol. 15, issue 09, article # 8

Protasevich A.E., Starikov V.I. Effect of vibrational excitations on critical parameters in gases of nonrigid polar molecules . // Atmospheric and oceanic optics. 2002. V. 15. No. 09. P. 712-715.
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Critical parameters of polar molecules of ammonia and water allowing large-amplitude vibrations are calculated through virial coefficients as functions of the concentration of vibrationally excited molecules. A model potential accounting for the dipole-dipole and dipole-quadrupole (for water vapor) interactions was used. A change in the dipole moment of molecules caused by excitation of a nonrigid vibrational mode is shown to lead to the dependence of critical parameters of gases on the concentration of excited molecules.