A superposition T-matrix code for computing electromagnetic scattering by randomly oriented two-sphere clusters with touching or separated components is available from Michael Mishchenko.

The code uses an analytical method for averaging over cluster orientations and is significantly faster than codes employing numerical integrations over orientation angles. The cluster components can be identical or can have different sizes and/or refractive indices. The component sphere size parameter can exceed 40.

• Link (28 Nov 2008)