Multipolar polarizabilities

Non-linear Multipolar Polarizabilities. Just as the polarizability tensor a in equation (68) defined a linear dipole moment, or moment of order 1 (as due to the first power of E), so the tensors p and y appearing in Bom s expansions (76) can be taken to define respectively a dipole moment of order 2 (induced by the square of E) ... 

A. Barreau, J. Berrue, A. Chave, B. Dumon, and M. Thibeau. Spectrum of collision induced scattering Role of multipolar polarizabilities. Optics Communic., 55 99-104 (1985). 

MULTIPOLAR POLARIZABILITIES FROM INTERACTION-INDUCED RAMAN SCATTERING... 

The excess collision-induced pair polarizability of molecules A and B results as a self-consistent solution of a set of equations for local fields polarizing molecules A and B and the multipolar moments induced in molecules A and B. In a first approximation, the long range field-induced change in the pair polarizability, related to the linear multipolar polarizabilities of molecules, is [27] ... 

The influence of multipolar polarizabilities has been examined subsequently in several optically isotropic molecules such as CH4, CD4, neopentane, CF4, or SF6 [4,7-14,17,18]. In this review, our attention is focused on CF4 for which both Rayleigh [8,13] and Vi Raman [17,18] depolarized and isotropic bands have been studied and published by us. In the Rayleigh studies, we measured the /j (v) and / (v) intensities that are scattered by gaseous CF4 up to 340 cm-1, in... 

It has been shown that multipolar polarizabilities contribute significantly to the collision-induced scattering from fluids composed of linear (N2, CO2) or... 

In summary, since the early 1980s or so, collision-induced light scattering experiments on molecular fluids have demonstrated that the study of the collision-induced absolute-unit spectra (depolarized and/or isotropic ones) is an useful tool, and up to now the only one, to measure multipolar polarizabilities of molecules. 

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