Light scattering theory, interaction-induced

G. Birnbaum, B. Guillot, and S. Bratos. Theory of Collision Induced Line Shapes— Absorption and Light Scattering at Low Densities. In I. Prigogine and S. A. Rice (ed.) Advances in Chemical Physics, Vol. 51, Wiley-Interscience, New York, 1982, pp. 49-112. G. Birnbaum (ed.). Phenomena Induced by Intermolec. Interactions. Plenum Press, New York, 1985. 

Here, a. and a L are the polarizabilities of the diatom parallel and perpendicular to the internuclear separation, R12. The electrostatic theory accounts for the distortions of the local field by the proximity of a point dipole (the polarized collisional partner) and suggests that the anisotropy is given by ft Rn) 6intermolecular interactions). This is the so-called dipole-induced dipole (DID) model, which approximates the induced anisotropy of such diatoms often fairly well. It gives rise to pressure-induced depolarization of scattered light, and to depolarized, collision-induced Raman spectra in general. 

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