Abstract

The long tails at low and high frequency in the Rayleigh scattering by gases comprising tetrahedral molecules is attributed to rotational Raman scattering. The rotating part of the collision-induced polarizability is due to the dipole–quadrupole polarizability A and varies as the inverse fourth power of the separation of the two interacting molecules. The rotational section rules are ΔJ = 0, ±1, ±2, ±3, and quantitative agreement is obtained with the observed frequency dependence of the tail in methane. Contributions due to hyperpolarizability are found to be small. A value for the dipole–quadrupole polarizability A of methane is obtained by attributing the excess scattering over that implied by the dipole–induced-dipole model to A.

© 1977 Optical Society of America

Collision-induced far-infrared absorption in helium-argon mixtures and nitrogen at high pressure

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