A T-matrix approach for particles with small-scale surface roughness

M. Kahnert, T. Rother


We combine group theory with a perturbation approach to perform T-matrix computations for particles with small-scale surface roughness up to size parameters of 70. The optical properties of high-order 3D-Chebyshev particles differ substantially from those of spheres. CPU times are reduced by more than 4-5 orders of magnitude by the use of group theory, while the perturbation approach circumvents the notorious ill-conditioning problems of the null-field method, thus allowing the treatment of large size parameters.


T matrix; Aerosols; Cosmic Dust

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DOI: http://dx.doi.org/10.1478/C1V89S1P045