Collision-induced light scattering by globular molecules

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Abstract
Applequist's atom dipole interaction model for the polarizability of polyatomic molecules is reexamined with a special view to computer simulations of collision-induced light scattering. For tetrahedral and octahedral molecules it is shown that, as far as the pair polarizability is concerned, this model is equivalent to a first-order DID mechanism between the individual atoms of the system, to which decoupled effective bond polarizabilities are assigned. In this form the Applequist model, which may be more appropriate than the multipole polarizability model for representing high-density systems, is then very suitable for computer simulations. Explicit expressions are given for the multipole polarizabilities of the Applequist model as well as for the effective bond polarizabilities of the equivalent atom-atom model.