Collision-induced vibrational polarizability and mixed second refractivity virial coefficients B^ab_R: an experimental study of the SF₆-rare gas mixtures

Author： Bulanin M. O. Burtsev A. P. Ladvishchenko Yu. M. Kerl K.

Publisher： Taylor & Francis Ltd

ISSN： 1362-3028

Source： Molecular Physics, Vol.97, Iss.12, 1999-12, pp. : 1233-1242

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Abstract

Mixed second refractivity virial coefficients B_R^ab (omega) are determined in the infrared spectral range from the analysis of the buffer gas-induced intensity redistribution in the upsilon₃ absorption band at omega 930 cm^-1 of ³⁴SF₆ perturbed by the rare gases Ar, Kr, and Xe at relative densities up to 140 Amagat. The values of the refractivity virial coefficients are found to be several orders of magnitude greater than those observed in the spectral regions far removed from single-photon resonances. The undamped dynamic dipole-induced-dipole (DID) model is shown to qualitatively correctly reproduce the observed unusual dispersion of the B_R^ab(omega) functions. A new estimate of the integrated band intensity S(upsilon₃) of SF₆ is also obtained.