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Scattering methods are widespread used to characterize the structure andconstituents of matter on small length scales. This motivates this introductorytext on identifying prospective approaches to scattering-based methods forgranular media. A survey to light scattering by particles and particleensembles is given. It is elaborated why the established scattering methodsusing X-rays and visible light cannot in general be transferred to granularmedia. Spectroscopic measurements using Terahertz radiation are highlighted asthey to probe the scattering properties of granular media, which are sensitiveto the packing structure. Experimental details to optimize spectrometer formeasurements on granular media are discussed. We perform transmissionmeasurements on static and agitated granular media using Fourier-transformspectroscopy at the THz beamline of the BessyII storage ring. The measurementsdemonstrate the potential to evaluate degrees of order in the media and totrack transient structural states in agitated bulk granular media.

Analysis of Granular Packing Structure by Scattering of THz Radiation