Scattering by Spherical Particles with Internal Structure

2 Scattering by Spherical Particles with Internal Structure Concentric Spheres 

In particular, the T-matrix approach as formulated by WATERMAN [4.21] and STROM [4.22] explicitly incorporates the symmetry of the scattering matrix due to the time-reversal invariance, and is sufficiently general to allow variations which yield different approximation schemes. An important feature of these methods is their applicability to scattering by objects of arbitrary shape. For some alternative formulations and numerical results see BARBER and YEN [4.23] and WATERMAN [4.24]. 

We have recently considered another approach, formulated by SAXON [4.25], and described in NEWTON [4.26], which is based on the fact that the scattered field may be expressed as an integral involving the internal field over the scatterer. 

A major advantage of this method is that there is no restriction on the shape of the, particle or its internal structure, although of course the size of the particle will be reflected in the amount of computer time needed to solve the integral equation (4.16). 

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